Document:

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                                                                    EXHIBIT 10.6

EMPLOYMENT AGREEMENT

     This  EMPLOYMENT  AGREEMENT,  made and  entered  into as of the 21st day of
November  2002,  by  and  between  Dtomi,  Inc.,  a  Nevada,   corporation  (the
"Corporation"),  and Mr. John  Thatch,  an  individual  residing in  Clearwater,
Florida (the "Executive").

WITNESSETH THAT:

     WHEREAS,  the  Corporation  desires to employ the Executive in the capacity
hereinafter  stated,  and the Executive  desires to enter into the employ of the
Corporation  in such capacity for the period and on the terms and conditions set
forth herein;

     NOW, THEREFORE, in consideration of the mutual covenants and agreements set
forth  below,  it is hereby  covenanted  and agreed by the  Corporation  and the
Executive as follows:

     1. Employment Period. The Corporation hereby agrees to employ the Executive
as its  President  and  Chief  Executive  Officer  and  the  Executive,  in such
capacities,  agrees  to  provide  services  to the  Corporation  for the  period
beginning on the date first above written  November 21, 2002 (the  "Commencement
Date") and ending on the third  anniversary of the Commencement  Date,  November
20, 2005 (the "Employment Period").

     2.  Performance of Duties.  The Executive agrees that during the Employment
Period,  while he is  employed  by the  Corporation,  he shall  devote  his best
efforts,  energies and talents to serving in the  capacities  of  President  and
Chief  Executive  Officer  of the  Corporation  in  the  best  interests  of the
Corporation, and to perform the duties assigned to him by the Board of Directors
faithfully,  efficiently  and  in  a  professional  manner;  provided  that  the
Executive  shall not,  without his  consent,  be  assigned  duties that would be
inconsistent  with those of the  President  and Chief  Executive  Officer of the
Corporation.  It is understood and hereby  acknowledged  that Executive is holds
other executive positions in both public and private companies.

     3.  Compensation.  Subject to the terms and  conditions of this  Agreement,
during the Employment Period, the Corporation shall compensate the Executive for
his services as follows:

          (a)  Executive  shall  receive,  for each  twelve  (12)  month  period
beginning  on the  Commencement  Date and each  anniversary  thereof,  a rate of
salary that is not less than One Hundred and Twenty Thousand Dollars  ($120,000)
per year, payable in substantially equal monthly or more frequent  installments.
The Corporation  shall also provide an additional Ten Thousand Dollars ($10,000)
yearly  for  executive  accountable  expenses,   payable  at  least  monthly  to
Executive.  During the Employment  Period the  Executive's  salary rate shall be
reviewed  by the  Board  of  Directors  on or  before  each  anniversary  of the
Commencement  Date to determine  whether an increase in his rate of compensation
is  appropriate.  Executive  agrees  however for the first twelve (12) months of
employment  to  accept  the rate of  salary  of  Seventy-Five  Thousand  Dollars
($75,000)  that  will be  reviewed  quarterly  for an  increase  by the Board of
Directors.

          (b)  Executive  shall  receive  an  option  to  acquire,   as  of  the
Commencement Date, One Million,  Eight Hundred Thirty-One Thousand Seven Hundred
Ninety-Eight (1,831,798) shares of the Corporation's common stock at an exercise
price  of one half of one cent  ($0.005),  plus  stock  options  which  shall be
determined by the Board of Directors.  The one half of one cent ($0.005) options
shall be effective immediately and shall be registered immediately.  The options
must be exercised by November 20, 2007, or the duration to exercise said options
may be extended  beyond  November 20, 2007,  if both  Corporation  and Executive
agree to amend this Agreement pursuant Section 11 of this Agreement.

          (c)  Executive  shall be  eligible to receive  incentive  compensation
payments,  which,  in the  aggregate,  are not less  than the  highest  salaried
payments  provided  to any  other  senior  executives  of the  Corporation.  The
Corporation intends to establish an incentive  compensation  program pursuant to
which such  incentive  payments  shall be paid to the Executive and, at the time
such program is established, payments there under shall be made to the Executive
as if

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such program was in effect as of the Commencement  Date based on the Executive's
performance or other relevant factors from the Commencement Date.

          (d)  Executive  shall  be a  participant  in the  following  executive
benefit plans maintained by the Corporation on substantially  the same terms and
conditions as other senior executives of the Corporation:  group life insurance,
group medical,  long-term  disability,  thrift,  pension,  vacation,  sick days,
educational assistance, vehicle allowance,  attendance awards and annual medical
physical.

          (e) Executive  shall be entitled to receive the following  perquisites
which shall not be less favorable to the Executive than the perquisites provided
by the Corporation immediately prior to the Employment Period:  reimbursement of
family  medical   insurance  of  Six  Hundred   Dollars   ($600.00)  per  month,
reimbursement of vehicle  allowance of Five Hundred Dollars  ($500.00) per month
and  reimbursement  of One Hundred Dollars  ($100.00) a month for cellular phone
expense. Executive acknowledges that company does not have a health benefit plan
at the  current  time,  and will only be  entitled  to the Six  Hundred  Dollars
($600.00)  per  month  reimbursement  if  he is  left  without  health  benefits
elsewhere.

          (f) Executive  shall be  reimbursed by the Company for all  reasonable
business, promotional, travel and entertainment expenses incurred or paid by him
during the  employment  period in the  performance  of his  services  under this
Agreement  provided  that the  Executive  furnishes  to the Company  appropriate
documentation  in a timely  fashion  required by the  Internal  Revenue  Code in
connection  with such  expenses and shall furnish such other  documentation  and
accounting as the Company may from time to time reasonably request.

          (g) It is  acknowledged  that the  Corporation  intends  to utilize an
employee leasing or payroll company. This employment agreement shall survive any
and  all  termination  of any  employee  leasing  and/or  payroll  company  that
Corporation  engages now or in the future.  The Executive  shall not give up any
rights  or  entitlements   under  any  such  employee   leasing  and/or  payroll
agreements.

     4.  Compensation Due Upon Termination.  Except as otherwise  provided under
the executive benefit plans maintained by the Corporation in which the Executive
participates in accordance  with  subparagraph  3(d), the  Executive's  right to
compensation  for periods  after the date his  employment  with the  Corporation
terminates shall be determined in accordance with the following:

          (a) Discharge  Without Cause. In the event the Corporation  terminates
the Executive's  employment  under this Agreement  without cause,  the Executive
shall be entitled to receive:

               (i) all payment of his salary (as of the date of  termination) in
accordance  with the  provisions of  subparagraph  3(a) for the remainder of the
Employment Period; and

               (ii)  payment  of  any  incentive   compensation   payments  that
otherwise  would have been  payable to the  Executive  under  subparagraph  3(c)
through the date his employment with the Corporation terminates.

          (b) Voluntary Resignation. The Corporation shall have no obligation to
make payments to the Executive in accordance  with the provisions of paragraph 3
for  periods  after  the  date on  which  the  Executive's  employment  with the
Corporation terminates due to the Executive's voluntary resignation.

          (c) Discharge for Cause.  The Corporation  shall have no obligation to
make payments to the Executive in accordance  with the provisions of paragraph 3
for periods after the Executive's  employment with the Corporation is terminated
on account of the Executive's  discharge for cause. For purposes of this Section
4, the Executive shall be considered  discharged for "cause" if he is discharged
by the  Corporation on account of the occurrence of one or more of the following
events:

     o    the Executive becomes habitually addicted to drugs or alcohol;

     o    the  Executive  discloses  confidential  information  in  violation of
          paragraph 5;

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     o    the Corporation is directed by regulatory or governmental  authorities
          to terminate the employment of the Executive.

     o    the Executive  flagrantly  disregards  his duties under this Agreement
          after  (A)  notice  has been  given to the  Executive  by the Board of
          Directors  of the  Corporation  that  it  views  the  Executive  to be
          flagrantly  disregarding  his duties under this  Agreement and (B) the
          Executive  has been given a period of ten (10) days after such  notice
          to cure such  misconduct  (provided that no such notice or cure period
          shall  be  required  if  Executive's   disregard  of  his  duties  has
          materially and adversely affected the Corporation);

     o    the  Executive  commits an act of fraud  against  the  Corporation  or
          violates a duty of loyalty to the Corporation or violates paragraph 2.

          (d)  Disability.  The  Corporation  shall have no  obligation  to make
payments to the Executive in accordance  with the  provisions of paragraph 3 for
periods  after  the  date  the  Executive's   employment  with  the  Corporation
terminates on account of  disability.  For purposes of this  subparagraph  4(d),
determination  of whether the  Executive  is  disabled  shall be  determined  in
accordance with the Corporation's  long term disability plan and applicable law,
except payments due and owing as of such date.

     5. Confidential Information.  Except as may be required by the lawful order
of a court or agency of competent  jurisdiction,  the  Executive  agrees to keep
secret and confidential  indefinitely all non-public  information concerning the
Corporation  and  its  affiliates  that  was  acquired  by or  disclosed  to the
Executive  during the course of his employment by the  Corporation or any of its
affiliates,  including  information  relating to customers  (including,  without
limitation,   credit  history,  repayment  history,  financial  information  and
financial statements), costs, and operations,  financial data and plans, whether
past,  current or planned  and not to  disclose  the same,  either  directly  or
indirectly,  to any other person,  firm or business entity,  or to use it in any
way; provided,  however, that the provisions of this paragraph 5 shall not apply
to  information  that is in the  public  domain  or that  was  disclosed  to the
Executive by  independent  third  parties who were not bound by an obligation of
confidentiality.  The  Executive  further  agrees  that he  shall  not  make any
statement or disclosure  that (a) would be  prohibited by applicable  federal or
state laws or (b) is  intended or  reasonably  likely to be  detrimental  to the
Corporation or any of its subsidiaries or affiliates.

     6. Successors. This Agreement shall be binding on, and inure to the benefit
of, the  Corporation  and its successors  and assigns and any person  acquiring,
whether  by  merger,  consolidation,  purchase  of assets or  otherwise,  all or
substantially all of the Corporation's assets and business.

     7.  Nonalienation.  The interests of the Executive under this Agreement are
not subject to the claims of his creditors, other than the Corporation,  and may
not otherwise be voluntarily or involuntarily assigned,  alienated or encumbered
except to the Executive's estate upon his death.

     8.  Remedies.  The Executive  acknowledges  that the  Corporation  would be
irreparably  injured  by a  violation  of  paragraphs  5,  and  agrees  that the
Corporation  shall be entitled to an injunction  restraining  the Executive from
any actual or  threatened  breach of  paragraph  5, or to any other  appropriate
equitable remedy without bond or other security being required.

     9. Waiver of Breach.  The waiver by either the Corporation or the Executive
of a breach of any provision of this Agreement shall not operate as or be deemed
a waiver of any subsequent breach by either the Corporation or the Executive.

     10. Notice.  Any notice to be given hereunder by a party hereto shall be in
writing and shall be deemed to have been given when received or, when  deposited
in the U.S. mail, certified or registered mail, postage prepaid:

          (e) to the Executive addressed as follows:

              Mr. John Thatch
              P.O. Box 8337
              Clearwater, Florida 33758

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          (f) to the Corporation addressed as follows:

              Dtomi, Inc.
              200 9th Avenue North
              Safety Harbor, Florida 34695

     11.  Amendment.  This  Agreement  may be  amended  or  cancelled  by mutual
agreement of the parties in writing  without the consent of any other person and
no person,  other than the parties thereto (and the Executive's  estate upon his
death), shall have any rights under or interest in this Agreement or the subject
matter hereof.

     12.  Applicable Law. The provisions of this Agreement shall be construed in
accordance with the internal laws of the State of Florida.

     13.  Termination.  All of the provisions of this Agreement  shall terminate
after the expiration of the Employment Period.

     IN WITNESS  WHEREOF,  the Executive and the Corporation  have executed this
employment agreement as of the day and year first above written.

Corporation:                                   DTOMI, INC.,

                                               By:  /s/David Otto
                                               ---------------------------------
                                               Name:  David M. Otto
                                               Title:  Director

Executive:                                         /s/ John Thatch
                                               ---------------------------------
                                               John Thatch

                                       18Exhibit 10.15

THIS NOTE HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED
(THE "ACT"), OR APPLICABLE STATE SECURITIES LAWS. NO INTEREST IN THIS NOTE MAY
BE OFFERED OR SOLD EXCEPT PURSUANT TO (i) AN EFFECTIVE REGISTRATION STATEMENT
UNDER THE ACT, OR (ii) AN EXEMPTION FROM REGISTRATION UNDER THE ACT WHERE THE
HOLDER HAS FURNISHED TO THE COMPANY AN OPINION OF ITS COUNSEL REASONABLY
SATISFACTORY TO THE COMPANY THAT AN EXEMPTION FROM REGISTRATION UNDER THE ACT IS
AVAILABLE

                            HUDSON TECHNOLOGIES, INC.

                        10% SUBORDINATED CONVERTIBLE NOTE

$_________________                                             December 20, 2002

                                                     Pearl River, New York

                             MAKER'S PROMISE TO PAY

      FOR VALUE RECEIVED, Hudson Technologies, Inc., a New York Corporation
having its principal offices located at 275 North Middletown Road, Pearl River,
New York (the "Maker") promises to pay, subject to the Conditions to Repayment
as set forth below, to the order of __________________________________ (the
"Payee") having an address at ________________, at Payee's address set forth
above (or at such other place as the holder of this Note may from time to time
direct by notice in writing to Maker), the principal sum of
______________________________($00.00) Dollars in such coin or currency of the
United States as shall at the time be legal tender for the payment of public and
private debts, on December , 2004 (the "Maturity Date") as evidenced by this
instrument (the "Note"). The Payee, assignee or anyone entitled to receive
payments under this Note shall be hereinafter referred to as the "Note Holder".

                                    INTEREST

      Interest will be charged on the outstanding principal of this Note from
time to time until the full amount of principal has been paid, at an annual rate
of ten (10.00%) percent (the "Note Rate").

                                    PAYMENTS

Subject to the Conditions to Repayment set forth below, interest accrued on the
outstanding principal amount of this Note shall be payable quarterly, in
arrears, on each of April 1, July 1, October 1, and January 1, (each an
"Interest Payment Date"), commencing on April 1, 2003. Payments shall be deemed
timely if made within fifteen (15) days of the Interest Payment Date. The
remainder accrued interest shall be payable in full on the earlier to occur of
(i) the Maturity Date and (ii) the date of the occurrence of an Event of Default
hereunder.

[Interest accrued on the outstanding principal amount of this Note shall
otherwise be payable quarterly in arrears on each of April 1, July 1, October 1,
2003 and January 1, (each an "Interest Payment Date"). Payee however has elected
to defer the payments of interest accruing on the outstanding principal of this
Note until the Maturity Date of the Note and all such deferred interest will be
added to the unpaid principal amount of the Note on each Interest Payment Date
and will accrue interest at the Note Rate.]

Interest shall accrue on past due principal and accrued and unpaid interest
(other than with respect to interest payments made within the grace period after
an Interest Payment Date as noted above in paragraph a) at the annual rate of
fifteen (15%) percent (the "Default Rate"). Notwithstanding anything to the
contrary contained in this Note, Maker shall not be obligated to pay, and the
Payee shall not be entitled to charge, collect or receive, interest in excess of
the maximum rate allowed by applicable law. During any period of time in which
the interest rate specified herein exceeds such maximum rate, interest shall
accrue and be payable at such maximum rate. Any amounts of interest collected by
Payee in excess of such maximum rate shall be deemed to apply to principal and
all payments of interest and principal shall be recalculated to allow for such
characterization.

All payments received on account of this Note shall be applied first to the
payment of accrued interest on this Note and then to the reduction of the unpaid
principal balance of this Note. Interest, whether at the Note Rate or the
Default Rate, shall be computed on the basis of a year of 360 days, for the
actual number of days elapsed.

[Other than with respect to the deferred quarterly interest payments], In the
event that the date for payment of any amount payable under this Note falls due
on a Saturday, Sunday or public holiday under the laws of the State of New York,
then such payment shall be made on the first business day following the date on
which such payment shall have so fallen due, without any interest or other
payment in respect of such delay, with the same force and effect as if made on
the date payment had originally fallen due.

                             MAKER'S RIGHT TO PREPAY

Subject to the Conditions to Repayment set forth below, upon twenty (20) days
prior written notice, Maker has the right to prepay, only in shares of common
stock, par value $.01 per share ("Common Stock") of the Maker based upon the
Conversion Rate (as defined below) of the Notes then in effect, all or any
portion of this Note without the consent of the holder and without a prepayment
penalty.

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Any partial prepayment shall be first applied to all accrued and unpaid interest
outstanding as of the date of the prepayment before applying any prepayment to
reduce the outstanding principal amount of the Note.

                             CONDITIONS TO REPAYMENT

Until all Obligations under the Loan Agreement dated as of April 29, 1998 (the
Loan Agreement), between The CIT Group/Business Credit, Inc. ("CIT Group") and
Hudson Technologies Company ("Hudson"), a wholly-owned subsidiary of the Maker,
are fully and finally paid and satisfied, the Maker shall not pay in cash any
principal or interest outstanding under this Note, including any cash prepayment
of principal or interest. For purposes of this Section 5, the term "Obligations"
means all revolving credit facilities, term loans, loans made for the purpose of
financing capital expenditures and accommodations including, without limitation,
letters of credit, bankers' acceptances, merchandise purchase guarantees or
other guarantees or indemnities for Hudson's account, currently outstanding or
hereinafter incurred and made or extended to Hudson by CIT Group and evidenced
by the Loan Agreement.

Notwithstanding anything to the contrary set forth in paragraph 5.1 above, the
Maker may make:

cash payments of interest on each Interest Payment Date provided that: (i) no
event of default under the Loan Agreement shall then exist or have occurred and
be continuing which event of default shall not have been cured by Hudson or
Maker or waived by CIT Group, and (ii) the aggregate amount of such payments of
interest by the Maker to the holders of notes of the series of which this Note
forms a part (the "Convertible Notes" which includes the convertible promissory
notes ("Exchange Notes") issued in exchange ("Note Exchange") for the Maker's
bridge notes and which Exchange Notes are identical in terms to the Convertible
Notes), shall not exceed $20,000 in any calendar year; and

cash payments of principal on the Maturity Date provided that: (i) no event of
default under the Loan Agreement shall then exist or have occurred and be
continuing, which event of default shall not have been cured by Hudson or Maker
or waived by CIT Group, and (ii) immediately after giving effect to any such
payment of principal and to any related payment or funding by Hudson to Maker,
Hudson having net availability (as such term is defined in the Loan Agreement)
of not less than $200,000 and combined net availability and cash balances of not
less then $850,000.

In the event that the cash payment of interest to Note Holders on any Interest
Payment Date shall exceed the maximum allowable pursuant to Section 5.2(a)
above, such cash payment of interest shall be made on a pro rata basis among the
Note Holders entitled to such interest payment based upon the percentage of each
such Note Holder's aggregate principal and accrued interest as of such Interest
Payment Date, against the aggregate principal amount and accrued interest under
the Notes held by the Note Holders entitled to such interest payment as of the
Interest Payment Date; and the balance of any such interest payment to each Note
Holder entitled thereto shall be added to principal amount of such Note Holder's
Note on the Interest Payment Date and shall accrue interest at the Note Rate.

This note is subject to the terms of a separate written consent by and between,
among others, maker, Hudson Technologies Company, CIT Group and Payee.

                       MAKER'S FAILURE TO PAY AS REQUIRED

      Not in limitation of any other right at law or in equity, upon the
occurrence of any of the following events of default (each, an "Event of
Default"), the unpaid principal amount of this Note shall become immediately due
and payable by the Maker, together with the interest accrued thereon, without
presentment, demand, protest or further notice of any kind, all of which are
hereby expressly waived by the Maker:

Other than as a result of the restrictions set forth in Section 5 above, the
Maker's failure to make any payment of principal and/or interest due under this
Note on the date the same is due;

Other than as a result of the restrictions set forth in Section 5 above, the
Maker's failure to keep and perform all promises, agreements, conditions and
provisions of this Note, which, if such default does not involve the payment of
money, is not cured within ten days;

The Maker makes a general assignment for the benefit of creditors; or files a
voluntary petition in bankruptcy, or a petition for reorganization, arrangement,
composition, readjustment or similar relief under any present or future statute,
law or regulation, or shall file an answer admitting or not contesting the
material allegations of a petition against it in any such proceeding; or admits
in writing its inability to pay its debts as they become due; or permits an
attachment to be made on any substantial part of Maker's property or assets; or
if an involuntary petition in bankruptcy is filed against any obligor and not
dismissed within sixty (60) days; or if a receiver or trustee is appointed for
all or any part of the property and assets of any obligor.

      Upon any such Event of Default, Maker will be liable to the Note Holder
for interest at the Default Rate from the date of such Event of Default,
together with all reasonable expenses incurred by the Note Holder in the
collection of this indebtedness resulting from such Event of Default, including,
without limitation, the Note Holder's reasonable fees for one attorney of its
choice for representation of the Note Holder in connection with the collection
of such indebtedness.

                                REQUIRED NOTICES

      Unless applicable law requires a different method, any notice required to
be given to any of the parties hereto shall be in writing and shall be deemed to
have been sufficiently given by delivering it or by mailing it by first class
mail to such party at the address set forth above or any alternate address as
provided by such party in writing.

                                   CONVERSION

The Note Holder, at his or its option, is entitled, upon but not prior to the
first anniversary of the date of this Note and at any time prior to the payment
in full of the principal amount of this Note by the Maker, to convert all of the
principal amount of this Note at the time outstanding or any portion thereof,
together with accrued but unpaid interest thereon, into shares ("Conversion
Shares") of Common Stock at an initial conversion price equal to the average
closing price of the Maker's Common Stock as reported on the Nasdaq Small

<PAGE>

Cap Market for the five business days preceding the date of this Note, which
shall be subject to adjustment from time to time pursuant to this Section 8
("Conversion Rate").

Conversion of this Note, and accrued and unpaid interest thereon, may be
effected by the Note Holder transmitting to the Maker, at its principal office
by facsimile transmission, a written notice (a "Conversion Notice") stating the
principal amount of the Note the Note Holder elects to convert in accordance
with the provisions of this Section 8.2 and specifying the name or names in
which such Note Holder wishes the certificate or certificates for Conversion
Shares to be issued and by delivering to the Maker, at such principal office
within ten (10) business days thereafter, the original Conversion Notice and
this Note by express courier. In case the Conversion Notice specifies a name or
names other than that of the Note Holder, such notice shall be accompanied by
payment of all transfer taxes payable upon the issuance of Conversion Shares in
such other name or names. Other than such taxes, the Maker will pay any and all
issue and other taxes (other than taxes based on income) that may be payable in
respect of any issue or delivery of Conversion Shares pursuant hereto. As
promptly as practicable, and in any event within five (5) business days after
the date of the receipt by the Maker of this Note or Notes and the receipt of
the original Conversion Notice relating thereto (the "Delivery Date") and, if
applicable, payment of all transfer taxes (or the demonstration to the
satisfaction of the Maker that such taxes have been paid), the Maker shall
deliver or cause to be delivered to Note Holder, by express courier,
certificates representing the number of validly issued, fully paid and
nonassessable full Conversion Shares to which the Note Holder shall be entitled.
Such conversion shall be deemed to have been made at the close of business on
the date of receipt by the Maker of a Conversion Notice by facsimile
transmission as permitted by this provisions of this Section 8.2, so that the
rights of the Note Holder under this Note shall cease, except for the right to
receive Conversion Shares with respect to the principal amount and accrued
unpaid interest thereon so converted and a new Note for any principal amount
remaining unpaid, and the person entitled to receive such Conversion Shares
shall be treated for all purposes as having become the record holder of such
Conversion Shares at such time, provided that if this Note and the original
Conversion Notice are not received by the Maker within ten (10) business days
after the Maker's receipt of a Conversion Notice by facsimile transmission, the
rights of the Note Holder under this Note (to the extent converted) will cease
at the close of business on the day the Maker actually receives the original
Note and the original Conversion Notice pertaining thereto.

Notwithstanding any contrary provision contained herein, at any time prior to
the first anniversary of this Note, all of the outstanding principal and accrued
interest of the Note shall either (i) be applied to the purchase of securities
to be offered by the Maker at the public offering purchase price, in any public
offering by the Maker of equity securities which, when aggregating the
outstanding principal and accrued interest of the Convertible Notes and all
additional proceeds from new investors, equals not less than $2,000,000 (the
"Equity Offering"), or (ii) in the event of such Equity Offering, be converted
into Conversion Shares at the then-effective Conversion Rate. The Note Holder
will have the right to determine, to the extent that securities are available
for purchase in the Equity Offering, whether to apply the outstanding principal
and interest, if any, of this Note to the purchase of the securities in the
Equity Offering or to convert the same into Conversion Shares at the
then-effective Conversion Rate; provided, however, that in the event that all or
a portion of outstanding principal and interest, if any, of this Note exceeds
the number of equity securities available in the Equity Offering, the balance of
this Note not applied to the purchase of equity securities will be converted
into Conversion Shares at the then-effective Conversion Rate.

Upon conversion, the Note Holder shall be entitled at the Note Holder's option,
to receive any accrued and unpaid interest on the principal amount of this Note
converted, to the date of such conversion, in the form of Conversion Shares.

In connection with the conversion of this Note, no fractional amount of
Conversion Shares shall be issued, but, in lieu thereof, the Maker shall round
such fractional amount to the nearest whole Conversion Share.

The Maker shall at all times reserve and keep available for issuance upon the
conversion of this Note, such number of its authorized but unissued shares of
Common Stock as will from time to time be sufficient to permit the conversion of
this Note in full, and shall take all action required to increase the authorized
number of shares of Common Stock if necessary to permit the conversion of this
Note in full.

o Except with respect to the securities set forth in paragraph (b) below, in
case the Maker shall at any time after the date hereof issue or sell any shares
of Common Stock, including shares held in the Maker's treasury, or shall issue
any options, rights or warrants to subscribe for shares of Common Stock or other
equity or debt securities exercisable into or exchangeable for shares of Common
Stock (each, an "Additional Issuance"), for a consideration per share less than
the Conversion Rate then in effect, the Conversion Rate shall be adjusted
immediately thereafter such that it shall equal the consideration per share
received by the Maker for the securities issued in such Additional Issuance.
Such adjustment shall be made successively whenever such an Additional Issuance
is made for consideration per share below the Conversion Rate then in effect.

The adjustment of the Conversion Rate set forth in paragraph (a) above shall not
apply to options granted by the Maker pursuant to stockholder-approved option
plans of the Maker nor to the issuance of Common Stock upon exercise of such
options or upon the exercise of options, warrants or other securities
exercisable for or exchangeable into Common Stock outstanding immediately prior
to the date of this Note or the conversion of convertible debt of the Maker
outstanding immediately prior to the date of this Note.

o In the event that, at any time and from time to time, the Maker shall issue
additional shares of Common Stock (or securities convertible into or
exchangeable for Common Stock) in a stock dividend, stock distribution, or
subdivision paid with respect to Common Stock, or declare any dividend or other
distribution payable with additional shares of Common Stock (or securities
convertible into or exchangeable for Common Stock) with respect to Common Stock,
or effect a split or subdivision of the outstanding shares of Common Stock, the
Conversion Rate shall, concurrently with the effectiveness of such stock
dividend, stock distribution, or subdivision, or the earlier declaration
thereof, be proportionately decreased, and the number of shares of Common Stock
issuable upon conversion of this Note shall be proportionately adjusted such
that, to avoid dilution of the Note Holder's position, the Note Holder

<PAGE>

shall thereafter be entitled to receive on conversion of this Note an additional
number of shares of Common Stock which such Note Holder would received upon or
by reason of any of the events described above, had this Note been converted
immediately prior to the occurrence of such event.

In the event the outstanding shares of Common Stock shall be combined or
consolidated, by reclassification or otherwise, into a lesser number of shares
of Common Stock, the Conversion Rate shall, concurrently with the effectiveness
of such combination or consolidation, be proportionately increased and the
number of shares of Common Stock issuable upon conversion of this Note shall be
proportionately adjusted so that the Note Holder shall be entitled to receive
upon conversion of this Note, the aggregate number of shares of Common Stock
which such Note Holder would have been entitled to receive if this Note had been
converted immediately prior to the occurrence of such combination or
consolidation.

In case of any consolidation or merger of the Maker with or into another
corporation or entity in which the Maker is not the surviving or resulting
company, or in case of any sale or conveyance to another company or entity of
all or substantially all of the assets of the Maker (each of the foregoing being
referred to as a "Transaction"), this Note shall thereafter be convertible into,
in lieu of Common Stock issuable upon such conversion prior to consummation of
such Transaction, the kind and amount of shares of stock and other securities
and/or property receivable (including cash) upon the consummation of such
Transaction by a holder of that number of shares of Common Stock into which this
Note was convertible immediately prior to such Transaction (including, on a pro
rata basis, the cash, securities or property received by holders of Common Stock
in any tender or exchange offer that is a step in such Transaction). In case
securities or property other than Common Stock shall be issuable or deliverable
upon conversion as aforesaid, then all references in this Section 8 shall be
deemed to apply, so far as appropriate and nearly as may be, to such other
securities or property.

For the purposes of any computation to be made in accordance with this Section,
the following provisions shall be applicable: (a) in case of the issuance or
sale of shares of Common Stock for a consideration part or all of which shall be
cash, the amount of the cash consideration therefor shall be deemed to be the
amount of cash received by the Maker for such shares (or, if shares of Common
Stock are offered by the Maker for subscription, the subscription price); (b) in
case of the issuance or sale (otherwise than as a dividend or other distribution
on any stock of the Maker) of shares of Common Stock for a consideration part or
all of which shall be other than cash, the amount of the consideration therefor
other than cash shall be deemed to be the value of such consideration as
determined in good faith by the Board of Directors of the Maker; (c) shares of
Common Stock issuable by way of dividend or other distribution on any stock of
the Maker shall be deemed to have been issued immediately after the opening of
business on the day following the record date for the determination of
shareholders entitled to receive such dividend or other distribution and shall
be deemed to have been issued without consideration; (d) the reclassification of
securities of the Maker other than shares of Common Stock into securities
including shares of Common Stock shall be deemed to involve the issuance of such
shares of Common Stock for a consideration other than cash immediately prior to
the close of business on the date fixed for the determination of security
holders entitled to receive such shares, and the value of the consideration
allocable to such shares of Common Stock shall be determined as provided above;
and (e) the number of shares of Common Stock at any one time outstanding shall
include the aggregate number of shares issued or issuable upon the exercise of
options, rights, warrants and upon the conversion or exchange of convertible or
exchangeable securities.

The Maker shall not, by amendment of its Articles of Incorporation or through
any reorganization, transfer of assets, consolidation, merger, dissolution,
issue or sale of securities or any other voluntary action, avoid or seek to
avoid the observance or performance of any of the terms to be observed or
performed hereunder by the Maker but will at all times in good faith assist in
the carrying out of all the provisions of this Section 8 and in the taking of
all such action as may be necessary or appropriate in order to protect the
conversion rights of the holders of the Convertible Notes against impairment.

Upon the occurrence of each adjustment to the Conversion Rate pursuant to this
Section 8, the Maker, at its expense, shall cause its independent auditors to
promptly compute such adjustment in accordance with the terms hereof and furnish
to each holder of Convertible Notes a certificate of such auditors setting forth
such adjustment and showing in detail the facts upon which such adjustment is
based.

The Maker shall mail to each holder of Convertible Notes at their addresses as
shown on the records of the Maker, as promptly as possible, but in any event not
fewer than 15 days prior to the applicable record date, a notice stating (i) the
date on which any merger, consolidation, recapitalization, or reorganization of
the Maker, or sale of all or substantially all of the Maker's assets, or any
other similar transaction or any corporate transaction requiring the vote of the
stockholders of the Maker, (ii) the record date therefor, and (iii) the
consideration (by class and series) to be paid to holders of capital stock of
the Maker upon consummation thereof.

                              ISSUANCE OF WARRANTS

      On the earlier of (a) December 20, 2003, or (b) the consummation by the
Maker of an Equity Offering described in Section 8.3 above, the Maker will issue
to the Note Holder Common Stock purchase warrants (the "Convertible Note
Warrants") to purchase an aggregate number of shares of Common Stock equal to
10% of the number of shares of Common Stock into which this Note is convertible
at December 20, 2002. Each Convertible Note Warrant will be exercisable to
purchase one share of Common Stock for a period of five years from issuance at
an exercise price (the "Exercise Price") equal to 110% of the lesser of (i) the
Conversion Rate of this Note as of December 20, 2002, or (ii) the Conversion
Rate of this Note on the date of issuance of the Convertible Note Warrants. The
Exercise Price of the Convertible Note Warrants will be subject to anti-dilution
adjustment on terms substantially similar to the anti-dilution adjustment of the
Conversion Rate of this Note set forth in Section 8 above.

<PAGE>

                                  MISCELLANEOUS

No delay or omission by the Note Holder in exercising any right or power
hereunder shall operate as a waiver of such right or power, and a waiver on one
occasion shall not be construed as a waiver or a bar to the exercise of any
right on any other occasion.

The rights and remedies of the Note Holder as provided in this Note shall be
cumulative and concurrent, and may be pursued singly, successively, or together
at the sole discretion of the Note Holder. The failure to exercise any such
right or remedy shall in no event be construed as a waiver or release of said
rights or remedies or of the right to exercise them at any time later.

None of the terms and conditions of this Note may be amended, modified or waived
orally, but only in a writing signed by the Maker and the Note Holder.

This Note shall be governed by, and construed in accordance with, the domestic
laws of the State of New York, without giving effect to any choice of law or
conflict of law provision or rule (whether of the State of New York or any other
jurisdiction) that would cause the application of the laws of any jurisdiction
other than the State of New York.

If any term or provision of this Note shall be held invalid, illegal or
unenforceable, the validity of all other terms and provisions hereof shall in no
way be affected hereby.

This Note shall be binding upon the Maker and the Maker's successors and
assigns; provided that the Maker may not assign this Note without the Note
Holder's consent.

WITNESS THE HAND(S) AND SEAL(S) OF THE UNDERSIGNED.

                                          HUDSON TECHNOLOGIES, INC., Maker

                                          By:
                                             -----------------------------------

                        BLANK ROME TENZER GREENBLATT LLP
                              The Chrysler Building
                              405 Lexington Avenue
                            New York, New York 10174

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