Document:

Exhibit 4.1.6

      SIXTH SUPPLEMENTAL INDENTURE ("Sixth Supplemental Indenture"), dated as of
June 25, 2004, among Phibro Animal Health Corporation, a New York corporation
(f/k/a Philipp Brothers Chemicals, Inc.) (the "Company"), each of the Guarantors
named herein (including each Guarantor whose guarantee is confirmed by, or
becomes effective pursuant to, this Sixth Supplemental Indenture), as
guarantors, and JPMorgan Chase Bank, as successor to The Chase Manhattan Bank,
as Trustee (the "Trustee"). All capitalized terms not otherwise defined herein
shall have the meaning assigned to them in the Indenture (as defined herein).

      WHEREAS, pursuant to a certain Indenture, dated as of June 11, 1998, among
the Company, the Guarantors named therein and the Trustee (as amended and as
otherwise in effect on the date hereof, the "Indenture"), the Company issued its
9 7/8% Senior Subordinated Notes due 2008, Series A and Series B (the "Notes");
and

      WHEREAS, in accordance with the Indenture, the Company has obtained the
written consent of the Holders of at least a majority in aggregate principal
amount of the outstanding Notes to certain amendments (the "Amendments") to the
Indenture as set forth in this Sixth Supplemental Indenture;

      WHEREAS, pursuant to Sections 9.02 and 12.16 of the Indenture, the Company
and the Guarantors, when authorized by resolution of their respective Boards of
Directors, and the Trustee, together, with the written consent of the Holders of
at least a majority in aggregate principal amount of the Notes then outstanding,
are authorized to amend or supplement the Indenture as set forth in this Sixth
Supplemental Indenture;

      WHEREAS, the Company, each of the Guarantors and the Trustee desire and
have agreed to execute and deliver this Sixth Supplemental Indenture as herein
provided and all conditions and requirements necessary to make this Sixth
Supplemental Indenture a valid, binding and legal instrument in accordance with
its terms have been performed and fulfilled and the execution and delivery
hereof have been in all respects duly authorized by all necessary parties.

      NOW, THEREFORE, for and in consideration of the premises contained herein,
it is mutually covenanted and agreed for the benefit of all Holders of the Notes
as follows:

      Section 1. The Indenture is hereby amended as set forth below in this
Section 1:

            (a) Section 6.01(iii). Section 6.01(iii) of the Indenture is further
      amended by adding after the words "Odda Smeltaverk SA" and before the
      semicolon the following: ", and further provided that if the inclusion of
      LC Holdings SA and La Cornubia SA in any such covenant, agreement or
      warranty in the term `Restricted Subsidiary' would result in such failure,
      then the term `Restricted Subsidiary' shall exclude L.C. Holdings SA and
      La Cornubia SA".

            (b) Section 6.01(iv). Section 6.01(iv) of the Indenture is further
      amended by adding the words "and also other than LC Holdings SA and La
      Cornubia SA" following

<PAGE>

      the   words "Odda Smeltaverk SA" appearing therein.

            (c) Section 6.01(v). Section 6.01(v) of the Indenture is amended by
      adding the words "and also other than LC Holdings SA and La Cornubia SA"
      following the words "Odda Smeltaverk SA" appearing therein.

      Section 2. The Company and the Guarantors agree that the Trustee is
permitted, and each of them hereby authorizes the Trustee, to place a notation
about this Sixth Supplemental Indenture on the Notes in accordance with the
provisions of Section 9.05 of the Indenture.

      Section 3. The Trustee accepts this Sixth Supplemental Indenture and
agrees to execute the trust created by the Indenture as hereby supplemented, but
only upon the terms and conditions set forth in the Indenture, including the
terms and provisions defining and limiting the liabilities and responsibilities
of the Trustee, which terms and provisions shall in like manner define and limit
its liabilities and responsibilities in the performance of the trust created by
the Indenture as hereby supplemented.

      Section 4. This Sixth Supplemental Indenture is executed and shall be
construed as an indenture supplemental to the Indenture and, as provided in the
Indenture, this Sixth Supplemental Indenture forms a part thereof. Except as
otherwise expressly provided for in this Sixth Supplemental Indenture, all of
the terms and conditions of the Indenture are hereby ratified and shall remain
unchanged and continue in full force and effect.

      Section 5. The recitals contained in this Sixth Supplemental Indenture
shall be taken as the statements made solely by the Company and the Guarantors,
and the Trustee shall have no liability or responsibility for their correctness,
and, without limiting the generality of the foregoing, the Trustee shall not be
responsible in any manner whatsoever for or with respect to any of (i) the
validity or sufficiency of this Sixth Supplemental Indenture or any of the terms
or provisions hereof, (ii) the proper authorization hereof by the Company and
the Guarantors by corporate action or otherwise, (iii) the due execution hereof
by the Company and the Guarantors or (iv) the consequences (direct or indirect
and whether deliberate or inadvertent) of any amendment herein provided for, and
the Trustee makes no representation with respect to any such matters.

      Section 6. This Sixth Supplemental Indenture shall become effective upon
the execution and delivery hereof by the Company, the Guarantors and the
Trustee.

      Section 7. THIS SIXTH SUPPLEMENTAL INDENTURE SHALL BE GOVERNED BY, AND
CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK, AS APPLIED TO
CONTRACTS MADE AND PERFORMED IN THE STATE OF NEW YORK, WITHOUT GIVING EFFECT TO
APPLICABLE PRINCIPLES OF CONFLICTS OF LAW TO THE EXTENT THAT THE APPLICATION OF
THE LAW OF ANOTHER JURISDICTION WOULD BE REQUIRED THEREBY.

      Section 8. This Sixth Supplemental Indenture may be signed in any number
of counterparts, each of which shall be an original, with the same effect as if
the signatures thereto

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and hereto were upon the same instrument.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

<PAGE>

                                   SIGNATURES

      IN WITNESS WHEREOF, the parties hereto have caused this Sixth Supplemental
Indenture to be duly executed, all as of the date first written above.

                                          PHIBRO ANIMAL HEALTH CORPORATION,
                                          a New York corporation

                                          By:    /s/ Jack C. Bendhiem
                                          --------------------------------------
                                          Name:  Jack C. Bendheim
                                          Title: President

                                          CP CHEMICALS, INC.,
                                          a New Jersey corporation, as Guarantor

                                          By:    /s/ David C. Storbeck
                                          --------------------------------------
                                          Name:  David C. Storbeck
                                          Title: Chief Financial Officer

                                          PRINCE AGRIPRODUCTS, INC.,
                                          a Delaware corporation, as Guarantor

                                          By:    /s/ David C. Storbeck
                                          --------------------------------------
                                          Name:  David C. Storbeck
                                          Title: Chief Financial Officer

                                          PHIBROCHEM, INC.,
                                          a New Jersey corporation, as Guarantor

                                          By:    /s/ David C. Storbeck
                                          --------------------------------------
                                          Name:  David C. Storbeck
                                          Title: Chief Financial Officer

<PAGE>

                                          PHIBRO CHEMICALS, INC.,
                                          a New York corporation, as Guarantor

                                          By:    /s/ David C. Storbeck
                                          --------------------------------------
                                          Name:  David C. Storbeck
                                          Title: Chief Financial Officer

                                          WESTERN MAGNESIUM CORP.,
                                          a California corporation, as Guarantor

                                          By:    /s/ David C. Storbeck
                                          --------------------------------------
                                          Name:  David C. Storbeck
                                          Title: Chief Financial Officer

                                          PHIBRO ANIMAL HEALTH HOLDINGS, INC.,
                                          a Delaware corporation, as Guarantor

                                          By:    /s/ David C. Storbeck
                                          --------------------------------------
                                          Name:  David C. Storbeck
                                          Title: Chief Financial Officer

                                          PHIBRO ANIMAL HEALTH U.S., INC.,
                                          a Delaware corporation, as Guarantor

                                          By:    /s/ David C. Storbeck
                                          --------------------------------------
                                          Name:  David C. Storbeck
                                          Title: Chief Financial Officer

<PAGE>

                                          JPMORGAN CHASE BANK, as Trustee

                                          By:    /s/ Diane M. Welsh
                                          --------------------------------------
                                          Name:  Diane M. Welsh
                                          Title: Authorized OfficerExhibit 4.2.1

      FIRST SUPPLEMENTAL INDENTURE ("Fist Supplemental Indenture"), dated as of
June 25, 2004, among Phibro Animal Health Corporation (the "U.S. Issuer"),
Phillip Brothers Netherlands III B.V. (the "Dutch Issuer" and with the U.S.
Issuer, the "Issuers"), each of the Guarantors named herein (including each
Guarantor whose guarantee is confirmed by, or becomes effective pursuant to,
this First Supplemental Indenture), as guarantors, and HSBC Bank USA, as Trustee
(the "Trustee"). All capitalized terms not otherwise defined herein shall have
the meaning assigned to them in the Indenture (as defined herein).

      WHEREAS the Issuers and the Guarantors named therein have heretofore
executed and delivered to the Trustee an Indenture (as such may be amended from
time to time, the "Indenture"), dated as of October 21, 2003, providing for the
issuance of 105,000 Units due 2007 (the "Units"), each Unit consisting of
$809.5238095 principal amount of 13% Senior Secured Notes due 2007 issued by
Phibro Animal Health Corporation and $190.4761905 principal amount of 13% Senior
Secured Notes due 2007 issued by Philipp Brothers Netherlands III B.V.
(together, the "Notes"); and

      WHEREAS, in accordance with the Indenture, the Issuers have obtained the
written consent of the Holders of at least a majority in aggregate principal
amount of the outstanding Notes to certain amendments (the "Amendments") to the
Indenture as set forth in this First Supplemental Indenture;

      WHEREAS, pursuant to Sections 9.02 and 12.16 of the Indenture, the Issuers
and the Guarantors, when authorized by resolution of their respective Boards of
Directors, and the Trustee, together, with the written consent of the Holders of
at least a majority in aggregate principal amount of the Notes then outstanding,
are authorized to amend or supplement the Indenture as set forth in this First
Supplemental Indenture;

      WHEREAS, the Issuers, each of the Guarantors and the Trustee desire and
have agreed to execute and deliver this First Supplemental Indenture as herein
provided and all conditions and requirements necessary to make this First
Supplemental Indenture a valid, binding and legal instrument in accordance with
its terms have been performed and fulfilled and the execution and delivery
hereof have been in all respects duly authorized by all necessary parties.

      NOW, THEREFORE, for and in consideration of the premises contained herein,
it is mutually covenanted and agreed for the benefit of all Holders of the Notes
as follows:

      Section 1. The Indenture is hereby amended as set forth below in this
Section 1:

            (a) Section 6.01(c). Section 6.01(c) of the Indenture is amended by
      adding after the word "Notes" and before the semicolon the following: ",
      and provided that if the inclusion of LC Holdings SA and La Cornubia SA in
      any such covenant, agreement or warranty in this Indenture or any
      Collateral Agreement would result in such failure, then such covenant,
      agreement or warranty in this Indenture or such Collateral Agreement shall
      be deemed to exclude LC Holdings SA and La Cornubia SA".

<PAGE>

            (b) Section 6.01(d). Section 6.01(d) of the Indenture is amended by
      adding the words "(other than LC Holdings SA and La Cornubia SA)"
      following the words "Restricted Subsidiary" appearing therein.

            (c) Section 6.01(e). Section 6.01(e) of the Indenture is amended by
      adding the words "(other than LC Holdings SA and La Cornubia SA)"
      following the words "Restricted Subsidiary" appearing therein.

            (d) Section 6.01(h). Section 6.01(h) of the Indenture is amended by
      adding, after the words "at maturity of the Notes", the words "; provided,
      that if the inclusion of LC Holdings SA (or any Equity Interests, Future
      Rights, Pledged Interests or Pledged Collateral (as each such term is
      defined in any such Collateral Agreement) of or pertaining to LLC Holdings
      SA), in any such Collateral Agreement would otherwise result in an Event
      of Default under this Section 6.01(h), then such Collateral Agreement
      shall be deemed to exclude LC Holdings SA (and such Equity Interests,
      Future Rights, Pledged Interests or Pledged Collateral, as the case may
      be)."

      Section 2. Each of the Collateral Agreements is hereby amended to provide
that, if the inclusion of LC Holdings SA, or any Equity Interests, Future
Rights, Pledged Interests or Pledged Collateral (as each such term is defined in
any such Collateral Agreement) of or pertaining to, LC Holdings SA in any
covenant, agreement, representation or warranty in such Collateral Agreement
would result in the failure to perform or comply with such covenant, agreement.
representation or warranty, then such covenant, agreement, representation or
warranty shall be deemed to exclude LC Holdings SA and such Equity Interests,
Future Rights, Pledged Interests or Pledged Collateral, as the case may be.

      Section 3. The Issuers and the Guarantors agree that the Trustee is
permitted, and each of them hereby authorizes the Trustee, to place a notation
about this First Supplemental Indenture on the Notes in accordance with the
provisions of Section 9.05 of the Indenture.

      Section 4. The Trustee accepts this First Supplemental Indenture and
agrees to execute the trust created by the Indenture as hereby supplemented, but
only upon the terms and conditions set forth in the Indenture, including the
terms and provisions defining and limiting the liabilities and responsibilities
of the Trustee, which terms and provisions shall in like manner define and limit
its liabilities and responsibilities in the performance of the trust created by
the Indenture as hereby supplemented.

      Section 5. This First Supplemental Indenture is executed and shall be
construed as an indenture supplemental to the Indenture and, as provided in the
Indenture, this First Supplemental Indenture forms a part thereof. Except as
otherwise expressly provided for in this First Supplemental Indenture, all of
the terms and conditions of the Indenture are hereby ratified and shall remain
unchanged and continue in full force and effect.

      Section 6. The recitals contained in this First Supplemental Indenture
shall be taken as the statements made solely by the Issuers and the Guarantors,
and the Trustee shall have no liability or responsibility for their correctness,
and, without limiting the generality of the

<PAGE>

foregoing, the Trustee shall not be responsible in any manner whatsoever for or
with respect to any of (i) the validity or sufficiency of this First
Supplemental Indenture or any of the terms or provisions hereof, (ii) the proper
authorization hereof by the Issuers and the Guarantors by corporate action or
otherwise, (iii) the due execution hereof by the Issuers and the Guarantors or
(iv) the consequences (direct or indirect and whether deliberate or inadvertent)
of any amendment herein provided for, and the Trustee makes no representation
with respect to any such matters.

      Section 7. This First Supplemental Indenture shall become effective upon
the execution and delivery hereof by the Issuers, the Guarantors and the
Trustee.

      Section 8. THIS FIRST SUPPLEMENTAL INDENTURE SHALL BE GOVERNED BY, AND
CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK, AS APPLIED TO
CONTRACTS MADE AND PERFORMED IN THE STATE OF NEW YORK, WITHOUT GIVING EFFECT TO
APPLICABLE PRINCIPLES OF CONFLICTS OF LAW TO THE EXTENT THAT THE APPLICATION OF
THE LAW OF ANOTHER JURISDICTION WOULD BE REQUIRED THEREBY.

      Section 9. This First Supplemental Indenture may be signed in any number
of counterparts, each of which shall be an original, with the same effect as if
the signatures thereto and hereto were upon the same instrument.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

<PAGE>

                                   SIGNATURES

      IN WITNESS WHEREOF, the parties hereto have caused this Sixth Supplemental
Indenture to be duly executed, all as of the date first written above.

                                        PHIBRO ANIMAL HEALTH CORPORATION

                                        By: /s/ Jack C. Bendheim
                                            ------------------------------------
                                            Name:  Jack C. Bendheim
                                            Title: President

                                        PHILIPP BROTHERS NETHERLANDS III B.V.
                                        By: Philipp Brothers Netherlands II B.V.

                                        By:  /s/ Jack C. Bendheim
                                            ------------------------------------
                                            Name:  Jack C. Bendheim
                                            Title: Managing Director

                                        By: /s/ Joseph M. Katzenstein
                                            ------------------------------------
                                            Name:  Joseph M. Katzenstein
                                            Title: Managing Director

                                        DOMESTIC GUARANTORS:
                                        PRINCE AGRIPRODUCTS, INC.
                                        PHIBROCHEM, INC.
                                        PHIBRO ANIMAL HEALTH HOLDINGS, INC.
                                        PHIBRO CHEMICALS, INC.
                                        WESTERN MAGNESIUM CORP.
                                        C P CHEMICALS, INC.
                                        PHIBRO-TECH, INC.
                                        PHIBRO ANIMAL HEALTH U.S., INC.

                                        By: /s/ David C. Storbeck
                                            ------------------------------------
                                            Name:  David C. Storbeck
                                            Title: Vice President

                                        FOREIGN GUARANTOR:
                                        PHIBRO ANIMAL HEALTH SA

                                        By: /s/ Jack C. Bendheim
                                            ------------------------------------
                                            Name:  Jack C. Bendheim
                                            Title: Director

<PAGE>

Accepted and Agreed to:
HSBC BANK USA, as Trustee and Collateral Agent

By: /s/ Herawatta Alli
    --------------------------------
    Name:  Herawatta Alli
    Title: Corporate Trust Officer

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