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Exhibit 99

Additional Information



The following persons directly hold the following percentages of the

outstanding shares of common stock of the issuer, Kronos Worldwide, Inc.

("Kronos"):



Valhi, Inc. ("Valhi")......................................50.0%

NL Industries, Inc. ("NL").................................30.4%

Annette C. Simmons..........................................0.7%

Harold C. Simmons...........................................0.7%

Contran Corporation ("Contran")...................less than 0.1%



The following persons directly hold the following percentages of

the outstanding shares of common stock of Valhi:



Valhi Holding Company ("VHC")..............................92.6%

Contran.....................................................0.9%

Harold Simmons Foundation, Inc. (the "Foundation")..........0.7%

Harold C. Simmons...........................................0.6%

Contran Amended and Restated Deferred

  Compensation Trust (the "CDCT")...........................0.3%

Annette C. Simmons..........................................0.2%

The Annette Simmons Grandchildren's Trust

  (the "Grandchildren's Trust") ..................less than 0.1%



     The following persons directly hold the following percentages

of the outstanding shares of common stock of NL:



Valhi......................................................83.0%

Harold C. Simmons...........................................2.2%

Annette C. Simmons..........................................0.9%

Kronos............................................less than 0.1%



     Dixie Rice Agricultural Corporation, Inc. ("Dixie Rice") is

the direct holder of 100% of the outstanding shares of common

stock of VHC. Contran is the holder of 100% of the outstanding

shares of common stock of Dixie Rice.



     Substantially all of Contran's outstanding voting stock is held by

trusts established for the benefit of certain children and grandchildren

of Harold C. Simmons (the "Trusts"), of which Mr. Simmons is the sole

trustee, or is held by Mr. Simmons or persons or other entities related

to Mr. Simmons.  As sole trustee of each of the Trusts, Mr. Simmons has

the power to vote and direct the disposition of the shares of Contran

stock held by each of the Trusts.  Mr. Simmons, however, disclaims

beneficial ownership of any shares of Contran stock that the Trusts hold.



     The Foundation is a tax-exempt foundation organized for

charitable purposes.  Harold C. Simmons is the chairman of the

board of the Foundation and may be deemed to control the

Foundation.



     U.S. Bank National Association serves as the trustee of the

CDCT. Contran established the CDCT as an irrevocable "rabbi

trust" to assist Contran in meeting certain deferred compensation

obligations that it owes to Harold C. Simmons.  If the CDCT assets are

insufficient to satisfy such obligations, Contran is obligated to satisfy

the balance of such obligations as they come due.  Pursuant to the terms

of the CDCT, Contran (i) retains the power to vote the shares of the

common stock held directly by the CDCT, (ii) retains dispositive power

over such shares and (iii) may be deemed the indirect beneficial

owner of such shares.



     Mr. Harold C. Simmons is chairman of the board of Kronos, NL, Valhi

and VHC and chairman of the board and chief executive officer of Contran.



     By virtue of the offices held, the stock ownership and his services

as trustee, all as described above, (a) Mr. Simmons may be deemed to

control certain of such entities and (b) Mr. Simmons and certain of such

entities may be deemed to possess indirect beneficial ownership of, and a

pecuniary interest in, shares of common stock directly held by certain of

such other entities. However, Mr. Simmons disclaims such beneficial

ownership of, and such pecuniary interest in, such shares beneficially

owned, directly or indirectly, by any of such entities, except to the

extent of his vested beneficial interest, if any, in the shares the CDCT

holds directly.



     The reporting person understands that NL (including a wholly owned

subsidiary of NL) and Kronos directly own 14,372,970 shares and 1,724,916

shares, respectively, of Valhi common stock as of the date of this

statement. As already stated, Valhi is the direct holder of approximately

83.0% of the outstanding shares of common stock of NL and 50.0% of the

outstanding shares of Kronos common stock.  As a result of Valhi's direct

and indirect ownership of NL and Kronos, the reporting persons further

understand that, pursuant to Delaware law, Valhi treats the shares of

Valhi common stock that NL and Kronos own as treasury stock for voting

purposes. For the purposes of this statement, such shares of Valhi common

stock that NL and Kronos hold directly are not deemed outstanding.



     Annette C. Simmons is the wife of Harold C. Simmons.  Mr. Simmons

may be deemed to share indirect beneficial ownership of the shares that

his wife holds directly.  Mr. Simmons disclaims beneficial ownership of

all securities that his wife holds directly.  Mrs. Simmons disclaims

beneficial ownership of all shares she does not hold directly.



     The Grandchildren's Trust is a trust of which Harold C. Simmons and

his wife are trustees and the beneficiaries are the grandchildren of his

wife.  Mr. Simmons, as co-trustee of this trust, has the power to vote

and direct the disposition of the shares of Valhi common stock the trust

holds. Mr. Simmons disclaims beneficial ownership of any shares that this

trust holds.