As filed with the Securities and Exchange Commission on November 6, 2003


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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549





                                     FORM 10
                                 Amendment No. 4



                   GENERAL FORM FOR REGISTRATION OF SECURITIES
     Pursuant to Section 12(b) or (g) of the Securities Exchange Act of 1934
                            ------------------------

                             Kronos Worldwide, Inc.
             (Exact name of registrant as specified in its charter)

            Delaware
(State or other jurisdiction of                     76-0294959
 incorporation or organization)          (I.R.S. Employer Identification No.)

                              Three Lincoln Centre
                          5430 LBJ Freeway, Suite 1700
                            Dallas, Texas 75240-2697
                                 (972) 233-1700
    (Address, including zip code, and telephone number, including area code,
                        of principal executive offices)


        Securities to be registered pursuant to Section 12(b) of the Act:

                                                Name of Each Exchange on Which
Title of Each Class to be so Registered         Each Class is to be Registered
------------------------------------------     --------------------------------
 Common Stock, par value $.01 per share             New York Stock Exchange

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     Securities to be registered pursuant to Section 12(g) of the Act: None

                         -------------------------------

                        Copies of Communications Sent To:

                               Don M. Glendenning
                                 Toni Weinstein
                            Locke Liddell & Sapp LLP
                          2200 Ross Avenue, Suite 2200
                               Dallas, Texas 75201
                            Telephone: (214) 740-8000
                            Facsimile: (214) 740-8800

                         -------------------------------



<PAGE>
                             KRONOS WORLDWIDE, INC.

I.   INFORMATION  INCLUDED IN INFORMATION  STATEMENT AND INCORPORATED IN FORM 10
     BY REFERENCE

                          CROSS-REFERENCE SHEET BETWEEN
                   INFORMATION STATEMENT AND ITEMS OF FORM 10

<TABLE>
<CAPTION>
Item No.    Item Caption                     Location in Information Statement
--------    -------------------------------  -----------------------------------
<S>         <C>                              <C>

Item 1.     Business                         "Summary"  (p. 1),  "Risk  Factors"
                                             (p.  8),  "Relationships  Among NL,
                                             Kronos and Their  Affiliates  After
                                             the    Distribution"    (p.    23),
                                             "Management's     Discussion    and
                                             Analysis of Financial Condition and
                                             Results  of  Operations"  (p.  28),
                                             "Business" (p. 47)

Item 2.     Financial Information            "Selected  Financial Data" (p. 26),
                                             "Management's     Discussion    and
                                             Analysis of Financial Condition and
                                             Results of Operations" (p. 28)

Item 3.     Properties                       "Business-Properties" (p. 52)


Item 4.     Security Ownership of Certain    "Principal Stockholders" (p. 59)
            Beneficial Owners and Management


Item 5.     Directors and Executive Officers "Management" (p. 53)


Item 6.     Executive Compensation           "Management" (p. 53)



Item 7.     Certain Relationships and        "Relationships Among NL, Kronos and
            Related Transactions             Their    Affiliates    After    the
                                             Distribution"   (p.  23),  "Certain
                                             Relationships      and      Related
                                             Transactions"        (p.       63),
                                             "Consolidated Financial Statements"
                                             (p. FB-1)


Item 8.     Legal Proceedings                "Business-Legal Proceedings" (p. 52)


Item 9.     Market Price and Dividends       "Summary"  (p. 1), "Risk  Factors,"
            on the Registrant's Common       (p. 8), "The Distribution" (p. 16),
            Equity and Related Stockholder   "Dividend    Policy"    (p.    25),
            Matters                          "Description  of Capital Stock" (p.
                                             66)



Item 11.    Description of Registrant's      "Description of Capital Stock" (p. 66)
            Securities to be Registered


Item 12.    Indemnification of Directors     "Description       of       Capital
            and Officer                      Stock--Liability                and
                                             Indemnification  of  Directors  and
                                             Officers" (p. 68)


Item 13.    Financial Statements and         "Unaudited   Pro  Forma   Condensed
            Supplementary Data               Consolidated  Financial Statements"
                                             (p. FA-1);  "Consolidated Financial
                                             Statements" (p. FB-1)

Item 15.    Financial Statements and         "Unaudited   Pro  Forma   Condensed
            Exhibits                         Consolidated  Financial Statements"
                                             (p. FA-1);  "Consolidated Financial
                                             Statements" (p. FB-1)
</TABLE>

II. INFORMATION NOT INCLUDED IN INFORMATION STATEMENT

Item 10. Recent Sales of Unregistered Securities

     None.

                                       2

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Item 14.  Changes  in and  Disagreements  with  Accountants  on  Accounting  and
Financial Disclosure

     None.

Item 15. Financial Statements and Exhibits

          (a) Financial Statement Schedules:
              Schedule I - Condensed Financial Information of Registrant**
              Schedule II - Valuation and Qualifying Accounts**

          (b) Exhibits:

Exhibit Number Description
-------------- -----------------------------------------------------------------

2.1**          Form of Distribution  Agreement  between NL Industries,  Inc. and
               Kronos Worldwide, Inc.


3.1**          First Amended and Restated Certificate of Incorporation of Kronos
               Worldwide, Inc.


3.2**          Amended and Restated Bylaws of Kronos Worldwide, Inc.


4.1**          Form of Common Stock Certificate of Kronos Worldwide, Inc.

4.2            Indenture  governing  the 8.875%  Senior  Secured Notes due 2009,
               dated as of June 28, 2002, between Kronos International, Inc. and
               The Bank of New York, as trustee -  incorporated  by reference to
               Exhibit  4.1  to  the  Quarterly   Report  on  Form  10-Q  of  NL
               Industries, Inc. for the quarter ended June 30, 2002
4.3            Form of  certificate  of  8.875%  Senior  Secured  Note  due 2009
               (included  as  Exhibit  A  to  Exhibit  4.2)  -  incorporated  by
               reference  to  Exhibit  4.2  to  Kronos   International,   Inc.'s
               Registration Statement on Form S-4 (File No. 333-100047).
4.4            Form of  certificate  of  8.875%  Senior  Secured  Note  due 2009
               (included  as  Exhibit  B  to  Exhibit  4.2)  -  incorporated  by
               reference   to  Exhibit  4.3  to  Kronos   International   Inc.'s
               Registration Statement on Form S-4 (File No. 333-100047).
4.5            Purchase  Agreement,  dated as of June  19,  2002,  among  Kronos
               International,  Inc., Deutsche Bank AG London,  Dresdner Bank AG,
               London Branch, and Commerzbank Aktiengesellschaft,  London Branch
               -  incorporated  by  reference  to Exhibit  4.4 to the  Quarterly
               Report on Form 10-Q of NL Industries,  Inc. for the quarter ended
               June 30, 2002.
4.6            Registration  Rights Agreement,  dated as of June 28, 2002, among
               Kronos  International,  Inc.,  Deutsche Bank AG London,  Dresdner
               Bank  AG,  London  Branch,  and  Commerzbank  Aktiengesellschaft,
               London Branch -  incorporated  by reference to Exhibit 4.5 to the
               Quarterly  Report on Form  10-Q of NL  Industries,  Inc.  for the
               quarter ended June 30, 2002.
4.7            Collateral Agency Agreement, dated as of June 28, 2002, among The
               Bank of New York, U.S. Bank, N.A. and Kronos International,  Inc.
               (filed  herewith  only with  respect  to  Sections  2, 5, 6 and 8
               thereof)  -  incorporated  by  reference  to  Exhibit  4.6 to the
               Quarterly  Report on Form  10-Q of NL  Industries,  Inc.  for the
               quarter ended June 30, 2002.
4.8            Security Over Shares Agreement (shares of Kronos Limited),  dated
               June 28, 2002, between Kronos International, Inc. and The Bank of
               New York, U.S., as trustee - incorporated by reference to Exhibit
               4.7 to the Quarterly  Report on Form 10-Q of NL Industries,  Inc.
               for the quarter ended June 30, 2002.
4.9            Pledge of Shares (shares of Kronos  Denmark ApS),  dated June 28,
               2002, between Kronos International,  Inc. and U.S. Bank, N.A., as
               collateral  agent -  incorporated  by reference to Exhibit 4.8 to
               the Quarterly Report on Form 10-Q of NL Industries,  Inc. for the
               quarter ended June 30, 2002.
4.10           Pledge  Agreement  (pledge of shares of Societe  Industrielle  du
               Titane, S.A.), dated June 28, 2002, between Kronos International,
               Inc. and U.S. Bank,  N.A., as collateral  agent - incorporated by
               reference to Exhibit 4.9 to the Quarterly  Report on Form 10-Q of
               NL Industries, Inc. for the quarter ended June 30, 2002.
4.11           Partnership  Interest Pledge  Agreement  (pledge of fixed capital
               contribution  in Kronos  Titan  GmbH & Co.  OHG),  dated June 28,
               2002, between Kronos International,  Inc. and U.S. Bank, N.A., as
               collateral  agent - incorporated  by reference to Exhibit 4.10 to
               the Quarterly Report on Form 10-Q of NL Industries,  Inc. for the
               quarter ended June 30, 2002.
10.1**         Form of Tax Agreement  between Valhi,  Inc. and Kronos Worldwide,
               Inc.

10.2**         Form  of  Intercorporate   Services   Agreement  between  Contran
               Corporation and Kronos Worldwide, Inc.

10.3**         Form of Promissory Note made by Kronos  Worldwide,  Inc. in favor
               of NL Industries, Inc.

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<PAGE>

10.4**         Form of Kronos Worldwide, Inc. Long-Term Incentive Plan

10.5           (euro)80,000,000  Facility Agreement,  dated June 25, 2002, among
               Kronos  Titan GmbH & Co. OHG,  Kronos  Europe  S.A./N.V.,  Kronos
               Titan A/S and Titania A/S, as borrowers,  Kronos Titan GmbH & Co.
               OHG, Kronos Europe S.A./N.V.  and Kronos Norge AS, as guarantors,
               Kronos  Denmark ApS, as security  provider,  Deutsche Bank AG, as
               mandated lead arranger,  Deutsche Bank Luxembourg  S.A., as agent
               and security  agent,  and KBC Bank NV, as fronting  bank, and the
               financial institutions listed in Schedule 1 thereto, as lenders -
               incorporated by reference to Exhibit 10.1 to the Quarterly Report
               on Form 10-Q of NL  Industries,  Inc. for the quarter  ended June
               30, 2002.
10.6           Lease  Contract,  dated June 21,  1952,  between  Farbenfabrieken
               Bayer  Aktiengesellschaft  and Titangesellschaft mit beschrankter
               Haftung (German language version and English translation thereof)
               - incorporated by reference to Exhibit 10.14 to the Annual Report
               on Form 10-K of NL  Industries,  Inc. for the year ended December
               31, 1985.
10.7           Contract on Supplies  and  Services,  dated as of June 30,  1995,
               among  Bayer  AG,   Kronos   Titan-GmbH  &  Co.  OHG  and  Kronos
               International,  Inc.  (English  translation  from German language
               document)  -  incorporated   by  reference  to  Exhibit  10.1  to
               Quarterly  Report on Form  10-Q of NL  Industries,  Inc.  for the
               quarter ended September 30, 1995.
10.8           Master  Technology  Exchange  Agreement,  dated as of October 18,
               1993, among Kronos Worldwide,  Inc. (f/k/a Kronos,  Inc.), Kronos
               Louisiana,  Inc.,  Kronos  International,   Inc.,  Tioxide  Group
               Limited and Tioxide  Group  Services  Limited -  incorporated  by
               reference to Exhibit 10.8 to the Quarterly Report on Form 10-Q of
               NL Industries, Inc. for the quarter ended September 30, 1993.
10.9           Services  Agreement,  dated as of January 1, 1995,  amended as of
               April 1, 2002, among NL Industries,  Inc.,  Kronos (US), Inc. and
               Kronos International, Inc. - incorporated by reference to Exhibit
               10.6 to Kronos  International,  Inc.'s Registration  Statement on
               Form S-4 (File No. 333-100047).
10.10          Form of Kronos Cost Sharing Agreement, effective as of January 1,
               2002, among Kronos International,  Inc., Kronos Europe S.A./N.V.,
               Kronos (US), Inc., NL Industries,  Inc.,  Kronos Titan GmbH & Co.
               OHG,  Societe  Industrielle  du Titane,  S.A.,  Kronos Titan A/S,
               Titania A/S, Kronos Limited,  Kronos Canada, Inc., Kronos Denmark
               ApS and Kronos  Louisiana  Inc. -  incorporated  by  reference to
               Exhibit  10.8  to  Kronos   International,   Inc.'s  Registration
               Statement on Form S-4 (File No. 333-100047).
10.11          Form of Assignment and Assumption Agreement,  dated as of January
               1, 1999, between Kronos (US), Inc. and Kronos International, Inc.
               -   incorporated   by   reference   to  Exhibit  10.9  to  Kronos
               International,  Inc.'s  Registration  Statement on Form S-4 (File
               No. 333-100047).
10.12          Form of Cross License Agreement, effective as of January 1, 1999,
               between Kronos Inc.  (formerly  known as Kronos (USA),  Inc.) and
               Kronos International, Inc. - incorporated by reference to Exhibit
               10.10 to Kronos International,  Inc.'s Registration  Statement on
               Form S-4 (File No. 333-100047).
10.13***       Richards  Bay Slag Sales  Agreement,  dated May 1, 1995,  between
               Richards Bay Iron and Titanium  (Proprietary)  Limited and Kronos
               Worldwide,  Inc. (f/k/a Kronos, Inc.) - incorporated by reference
               to  Exhibit  10.17  to the  Annual  Report  on Form  10-K  for NL
               Industries, Inc. for the year ended December 31, 1995.
10.14***       Amendment  to  Richards  Bay Slag Sales  Agreement,  dated May 1,
               1999,  between  Richards  Bay  Iron  and  Titanium  (Proprietary)
               Limited  and  Kronos  Worldwide,  Inc.  (f/k/a  Kronos,  Inc.)  -
               incorporated by reference to Exhibit 10.4 to the Annual Report on
               Form 10-K for NL Industries, Inc. for the year ended December 31,
               1999.
10.15***       Amendment  to Richards  Bay Slag Sales  Agreement,  dated June 1,
               2001,  between  Richards  Bay  Iron  and  Titanium  (Proprietary)
               Limited  and  Kronos  Worldwide,  Inc.  (f/k/a  Kronos,  Inc.)  -
               incorporated by reference to Exhibit 10.5 to the Annual Report on
               Form 10-K for NL Industries, Inc. for the year ended December 31,
               2001.
10.16***       Amendment to Richards Bay Slag Sales Agreement dated December 20,
               2002 between Richards Bay Iron and Titanium (Proprietary) Limited
               and Kronos Worldwide, Inc. (f/k/a Kronos, Inc.) - incorporated by
               reference to Exhibit  10.7 to the Annual  Report on Form 10-K for
               NL Industries, Inc. for the year ended December 31, 2002.
10.17***       Agreement  between  Sachtleben  Chemie GmbH and Kronos Titan-GmbH
               effective  December  30,  1986 -  incorporated  by  reference  to
               Exhibit 10.1 of Kronos International,  Inc.'s Quarterly Report on
               Form  10-Q  for the  quarter  ended  September  30,  2002.
10.18          Supplementary  Agreement  to the  Agreement  of December 30, 1986
               between Sachtleben Chemie GmbH and Kronos Titan-GmbH dated May 3,
               1996 -  incorporated  by  reference  to  Exhibit  10.2 of  Kronos
               International,  Inc.'s  Quarterly  Report  on Form  10-Q  for the
               quarter  ended  September  30, 2002.

                                       4

<PAGE>


10.19          Second Supplementary Agreement to the Contract dated December 30,
               1986 between  Sachtleben  Chemie GmbH and Kronos Titan-GmbH dated
               January 8, 2002 -  incorporated  by  reference to Exhibit 10.3 of
               Kronos  International,  Inc.'s  Quarterly Report on Form 10-Q for
               the quarter ended September 30, 2002.
10.20          Formation  Agreement  dated as of October 18, 1993 among  Tioxide
               Americas  Inc.,  Kronos  Louisiana,  Inc. and  Louisiana  Pigment
               Company,  L.P. - incorporated  by reference to Exhibit 10.2 to NL
               Industries,  Inc.'s Quarterly Report on Form 10-Q for the quarter
               ended September 30, 1993.
10.21          Joint  Venture  Agreement  dated as of October 18,  1993  between
               Tioxide Americas Inc. and Kronos  Louisiana,  Inc. - incorporated
               by reference to Exhibit 10.3 to NL Industries,  Inc.'s  Quarterly
               Report on Form 10-Q for the quarter ended September 30, 1993.
10.22          Kronos  Offtake  Agreement  dated as of October 18, 1993  between
               Kronos  Louisiana,  Inc. and Louisiana  Pigment  Company,  L.P. -
               incorporated  by  reference  to  Exhibit  10.4 to NL  Industries,
               Inc.'s  Quarterly  Report  on Form  10-Q  for the  quarter  ended
               September 30, 1993.
10.23          Amendment No. 1 to Kronos Offtake  Agreement dated as of December
               20, 1995 between  Kronos  Louisiana,  Inc. and Louisiana  Pigment
               Company,  L.P. ? incorporated by reference to Exhibit 10.22 to NL
               Industries,  Inc.'s Annual Report on Form 10-K for the year ended
               December 31, 1995.
10.24          Tioxide Americas  Offtake  Agreement dated as of October 18, 1993
               between Tioxide Americas Inc. and Louisiana Pigment Company, L.P.
               -  incorporated  by reference  to Exhibit 10.5 to NL  Industries,
               Inc.'s  Quarterly  Report  on Form  10-Q  for the  quarter  ended
               September 30, 1993.
10.25          Amendment No. 1 to Tioxide Americas Offtake Agreement dated as of
               December 20, 1995 between  Tioxide  Americas  Inc. and  Louisiana
               Pigment  Company,  L.P. -  incorporated  by  reference to Exhibit
               10.24 to NL Industries, Inc.'s Annual Report on Form 10-K for the
               year ended December 31, 1995.
10.26          TCI/KCI Output  Purchase  Agreement  dated as of October 18, 1993
               between   Tioxide   Canada  Inc.  and  Kronos   Canada,   Inc.  -
               incorporated  by  reference  to  Exhibit  10.6 to NL  Industries,
               Inc.'s  Quarterly  Report  on Form  10-Q  for the  quarter  ended
               September 30, 1993.
10.27          TAI/KLA Output  Purchase  Agreement  dated as of October 18, 1993
               between  Tioxide  Americas  Inc.  and  Kronos  Louisiana,  Inc. -
               incorporated  by  reference  to  Exhibit  10.7 to NL  Industries,
               Inc.'s  Quarterly  Report  on Form  10-Q  for the  quarter  ended
               September 30, 1993.
10.28          Master Technology Exchange Agreement dated as of October 18, 1993
               among  Kronos  Worldwide,   Inc.  (f/k/a  Kronos,  Inc.),  Kronos
               Louisiana,  Inc.,  Kronos  International,   Inc.,  Tioxide  Group
               Limited and Tioxide  Group  Services  Limited -  incorporated  by
               reference  to Exhibit  10.8 to NL  Industries,  Inc.'s  Quarterly
               Report on Form 10-Q for the quarter ended September 30, 1993.
10.29          Parents'  Undertaking  dated as of October 18,  1993  between ICI
               American Holdings Inc. and Kronos Worldwide,  Inc. (f/k/a Kronos,
               Inc.)  -  incorporated   by  reference  to  Exhibit  10.9  to  NL
               Industries,  Inc.'s Quarterly Report on Form 10-Q for the quarter
               ended September 30, 1993.
10.30          Allocation Agreement dated as of October 18, 1993 between Tioxide
               Americas Inc., ICI American  Holdings,  Inc.,  Kronos  Worldwide,
               Inc.  (f/k/a  Kronos,   Inc.)  and  Kronos   Louisiana,   Inc.  -
               incorporated  by  reference  to Exhibit  10.10 to NL  Industries,
               Inc.'s  Quarterly  Report  on Form  10-Q  for the  quarter  ended
               September 30, 1993.
10.31          Purchase  Agreement  dated  January  4, 2002 by and among  Kronos
               Worldwide,  Inc. (f/k/a Kronos,  Inc.) as the Purchaser,  and Big
               Bend  Holdings  LLC and  Contran  Insurance  Holdings,  Inc.,  as
               Sellers  regarding  the sale and purchase of EWI RE, Inc. and EWI
               RE, Ltd. -  incorporated  by reference to Exhibit 10.40 to the NL
               Industries,  Inc.'s Annual Report on Form 10-K for the year ended
               December 31, 2001.

10.32**        Amendment  dated  August 11, 2003 to the Contract on Supplies and
               Services  among Bayer AG, Kronos  Titan-GmbH & Co. OHG and Kronos
               International (English translation of German language document).


21.1**         Subsidiaries.




99.1*          Definitive Information Statement dated November 10, 2003.



--------------------------

*    Filed herewith.
**   Previously filed.
***  Portions  of the  exhibit  have been  omitted  pursuant  to a  request  for
     confidential treatment.


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<PAGE>


                                   SIGNATURES

          Pursuant to the requirements of Section 12 of the Securities  Exchange
     Act of 1934, the registrant has duly caused this registration  statement to
     be signed on its behalf by the undersigned, thereunto duly authorized.

                                     KRONOS WORLDWIDE, INC.
                            By:      /s/ Robert D. Graham
                                     -----------------------------------
                                     Robert D. Graham
                                     Vice President, General Counsel & Secretary




Dated:  November 6, 2003




























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