Kronos Worldwide, Inc.                  Contact:   Gregory M. Swalwell
Three Lincoln Centre                               Vice President, Finance
5430 LBJ Freeway, Suite 1700                         and Chief Financial Officer
Dallas, TX  75240-2697                             (972) 233-1700
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News Release
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[LOGO GOES HERE]

FOR IMMEDIATE RELEASE


                 KRONOS WORLDWIDE REPORTS SECOND QUARTER RESULTS


DALLAS,   TEXAS...August  4,  2006...Kronos  Worldwide,  Inc.  (NYSE:KRO)  today
reported net income for the second quarter of 2006 of $13.6 million, or $.28 per
diluted share,  compared with net income of $32.9  million,  or $.67 per diluted
share,  in the second quarter of 2005. For the first six months of 2006,  Kronos
reported net income of $28.6 million,  or $.58 per diluted share,  compared with
net income of $54.3 million, or $1.11 per diluted share, in the first six months
of 2005.

Net sales of $345.1 million in the second quarter of 2006 were $33.4 million, or
11%, higher than the second quarter of 2005. Net sales of $649.4 million for the
first six months of 2006 were $45.9  million,  or 8%,  higher than the first six
months of 2005. Net sales  increased in the second quarter of 2006 primarily due
to higher TiO2 sales  volumes,  partially  offset by lower  average TiO2 selling
prices,  and the unfavorable effect of fluctuations in foreign currency exchange
rates,  which decreased sales by approximately $4 million.  For the year-to-date
period, net sales increased due to higher TiO2 sales volumes,  as well as higher
average TiO2  selling  prices,  which was  partially  offset by the  unfavorable
effect of fluctuations in foreign currency  exchange rates,  decreasing sales by
approximately  $19 million.  The table at the end of this release shows how each
of these items impacted the overall increase in sales.

The  Company's  TiO2 segment  profit (see  description  of non-GAAP  information
below) for the  second  quarter of 2006 was $38.4  million  compared  with $59.2
million in the second  quarter of 2005,  and was $74.6 million for the first six
months of 2006  compared  with $107.2  million for the first six months of 2005.
Segment profit  decreased in the second quarter of 2006,  compared to the second
quarter  2005,  due to the net effects of lower  average  TiO2  selling  prices,
higher manufacturing costs,  particularly raw materials and energy costs, higher
sales  volumes,  and the effect of  fluctuations  in foreign  currency  exchange
rates, which negatively impacted segment profit comparisons by approximately $11
million.  Full  year  segment  profit  decreased  primarily  due to  the  higher
manufacturing  costs,  partially  offset by higher average TiO2 selling  prices,
higher  sales  volumes,  and the  effect of  fluctuations  in  foreign  currency
exchange  rates,  which  negatively   impacted  segment  profit  comparisons  by
approximately $16 million.

The  Company's  second  quarter 2006 TiO2 sales  volumes  increased 14% from the
second quarter of 2005,  primarily due to higher sales volumes in the US, Europe
and export markets offsetting the effects of lower sales volumes in Canada. TiO2
sales volumes for the first six months of 2006  increased 11% from the first six
months of 2005. The Company's TiO2  production  volumes were 2% and 3% higher in
the second quarter and first six months of 2006 respectively, as compared to the
same periods in 2005, with operating rates at near full capacity in all periods.
The Company's  finished goods  inventories at June 30, 2006,  which  represented
approximately 2 months of average sales,  were lower compared to March 31, 2006.
The Company's TiO2 sales and production  volumes in the first six months of 2006
were both records for Kronos.

The  Company's  results  in the  second  quarter  of 2005  include a  securities
transaction  gain of $5.4 million ($3.5 million,  or $.07 per diluted share, net
of income taxes) related to a gain on the sale of the company's passive interest
in a Norwegian smelting operation.






As previously  reported,  in April 2006 the Company's  wholly-owned  subsidiary,
Kronos  International,  Inc.  ("KII")  issued an  aggregate  of euro 400 million
principal  amount of new 6.5% Senior  Secured Notes due April 2013. KII used the
proceeds from the issuance of the 6.5% Senior Secured Notes to redeem all of its
8.875% Senior  Secured Notes in May 2006 at 104.437% of the aggregate  principal
amount of euro 375  million.  The Company  recognized  a $22.3  million  pre-tax
charge ($14.8 million,  or $.30 per diluted share, net of income tax benefit) in
the second  quarter of 2006  related to the early  extinguishment  of the 8.875%
Senior Secured Notes. Other interest income increased for the second quarter and
the first six months of 2006, due primarily to the interest  earned from the net
proceeds  of the new 6.5%  Senior  Secured  Notes  which were held in escrow for
approximately one month until the 8.875% Senior Secured Notes were redeemed.

The  Company's  income tax  benefit in the first six months of 2006  includes an
aggregate  tax  benefit  of $12.6  million,  or $.26 per  diluted  share  ($11.6
million,  or $.24 per diluted share,  for the second quarter of 2006) related to
the withdrawal of certain income tax assessments  previously made by the Belgian
and Norwegian tax  authorities,  the favorable  resolution of certain income tax
issues  related to our German and  Belgian  operations  and the  enactment  of a
reduction in the Canadian federal income tax rate.

The statements in this release relating to matters that are not historical facts
are  forward-looking   statements  that  represent   management's   beliefs  and
assumptions  based on  currently  available  information.  Although  the Company
believes that the expectations reflected in such forward-looking  statements are
reasonable,  it cannot give any assurances that these expectations will prove to
be correct.  Such  statements  by their  nature  involve  substantial  risks and
uncertainties  that could  significantly  impact  expected  results,  and actual
future   results  could  differ   materially   from  those   described  in  such
forward-looking  statements.  While it is not  possible to identify all factors,
the Company  continues  to face many risks and  uncertainties.  The factors that
could cause actual  future  results to differ  materially  include,  but are not
limited to, the following:

o    Future supply and demand for the Company's products,
o    The extent of the  dependence  of certain of the  Company's  businesses  on
     certain market sectors,
o    The cyclicality of the Company's businesses,
o    Customer  inventory  levels  (such as the  extent  to which  the  Company's
     customers may, from time to time,  accelerate  purchases of TiO2 in advance
     of  anticipated  price  increases or defer  purchases of TiO2 in advance of
     anticipated price decreases),
o    Changes in raw material and other operating costs (such as energy costs),
o    The possibility of labor disruptions,
o    General global  economic and political  conditions  (such as changes in the
     level of gross  domestic  product in  various  regions of the world and the
     impact of such changes on demand for TiO2),
o    Competitive products and substitute products,
o    Customer and competitor strategies,
o    The impact of pricing and production decisions,
o    Competitive technology positions,
o    The introduction of trade barriers,
o    Fluctuations  in currency  exchange  rates (such as changes in the exchange
     rate between the U.S. dollar and each of the euro, the Norwegian kroner and
     the Canadian dollar),
o    Operating  interruptions  (including,  but not limited to, labor  disputes,
     leaks,  natural  disasters,  fires,  explosions,  unscheduled  or unplanned
     downtime and transportation interruptions),
o    The timing and amounts of insurance recoveries,
o    The ability of the Company to renew or refinance credit facilities,
o    The ultimate  outcome of income tax audits,  tax settlement  initiatives or
     other tax matters,
o    The ultimate ability to utilize income tax attributes, the benefit of which
     has been recognized under the "more-likely-than-not" recognition criteria,
o    Environmental  matters  (such as those  requiring  emission  and  discharge
     standards for existing and new facilities),
o    Government laws and regulations and possible changes therein,
o    The ultimate resolution of pending litigation, and
o    Possible future litigation.

Should one or more of these risks  materialize  (or the  consequences  of such a
development  worsen),  or should the  underlying  assumptions  prove  incorrect,
actual results could differ  materially from those  forecasted or expected.  The
Company   disclaims  any  intention  or  obligation  to  update  or  revise  any
forward-looking statement whether as a result of changes in information,  future
events or otherwise.

In an effort to provide  investors  with  additional  information  regarding the
Company's results of operations as determined by accounting principles generally
accepted  in the  placecountry-regionUnited  States  of  America  ("GAAP"),  the
Company has disclosed certain non-GAAP  information,  which the Company believes
provides useful information to investors:

o    The  Company  discloses  segment  profit,  which  is used by the  Company's
     management to assess the performance of the Company's TiO2 operations.  The
     Company believes  disclosure of segment profit provides useful  information
     to investors  because it allows investors to analyze the performance of the
     Company's  TiO2  operations in the same way that the  Company's  management
     assesses  performance.  The Company defines segment profit as income before
     income  taxes,  interest  expense  and  certain  general  corporate  items.
     Corporate items excluded from the  determination  of segment profit include
     corporate  expense and interest  income not  attributable  to the Company's
     TiO2 operations.

Kronos  Worldwide,  Inc. is a major  international  producer of titanium dioxide
pigments.







                             KRONOS WORLDWIDE, INC.
                   CONDENSED CONSOLIDATED STATEMENTS OF INCOME
               (In millions, except per share and metric ton data)
                                   (Unaudited)




                                                                  Three months ended          Six months ended
                                                                       June 30,                   June 30,
                                                               -----------------------------------------------------
                                                                   2005        2006          2005         2006
                                                               -----------------------------------------------------

                                                                                            
Net sales                                                        $   311.7   $   345.1     $   603.5    $   649.4
Cost of sales                                                        217.1       263.1         424.7        492.6
                                                                 ---------   ---------     ---------    ---------

    Gross margin                                                      94.6        82.0         178.8        156.8

Selling, general and administrative expense                           37.8        41.3          75.1         79.1
Other operating income (expense):

  Currency transaction gains (losses), net                             2.4        (2.0)          3.3         (2.9)
  Disposition of property & equipment                                  (.1)        (.7)          (.1)        (1.1)
  Other income                                                         -           -              .1          -
                                                                      (1.4        (1.2)         (2.9)        (2.6)
                                                                 ---------   ---------     ---------    ---------

    Income from operations                                            57.7        36.8         104.1         71.1

Other income (expense):
  Trade interest income                                                 .1          .4            .2           .9
  Other interest income                                                 .3          .9            .7          1.0
  Securities transaction gain                                          5.4         -             5.4          -
  Loss on prepayment of debt                                           -         (22.3)          -          (22.3)
  Interest expense                                                   (11.6)      (13.1)        (23.4)       (23.8)
                                                                 ---------   ---------     ---------    ---------

    Income before income taxes                                        51.9         2.7          87.0         26.9

Provision for income taxes (benefit)                                  19.0       (10.9)         32.7         (1.7)
                                                                 ---------   ---------     ---------    ---------

    Net income                                                   $    32.9   $    13.6     $    54.3    $    28.6
                                                                 =========   =========     =========    =========

Basic and diluted net income per share                           $     .67   $     .28      $   1.11    $     .58
                                                                 =========   =========     =========    =========


Basic and diluted weighted-average
shares used in the calculation of net
income per share                                                      48.9        48.9          48.9         48.9

TiO2 data - metric tons in thousands:
  Sales volumes                                                      122         139           237          264
  Production volumes                                                 127         130           249          257









                             KRONOS WORLDWIDE, INC.

                       RECONCILIATION OF SEGMENT PROFIT TO
                             INCOME FROM OPERATIONS
                                  (In millions)
                                   (Unaudited)




                                                                  Three months ended          Six months ended
                                                                       June 30,                   June 30,
                                                               -----------------------------------------------------
                                                                   2005        2006          2005         2006
                                                               -----------------------------------------------------

                                                                                           
Segment profit                                                  $    59.2   $    38.4    $    107.2    $     74.6
Adjustments:
   Trade interest income                                              (.1)        (.4)          (.2)          (.9)
   Corporate expense                                                 (1.4        (1.2)         (2.9)         (2.6)
                                                                ---------   ---------    ----------    ----------

Income from operations                                          $    57.7   $    36.8    $    104.1    $     71.1
                                                                =========   =========    ==========    ==========






                      IMPACT OF PERCENTAGE CHANGE IN SALES
                                   (Unaudited)




                                                                  Three months ended            Six months ended
                                                                       June 30,                     June 30,
                                                                     2006 vs. 2005                2006 vs. 2005
                                                                  -------------------           ----------------
                                                                                                  
Percent change in sales:
    TiO2 product pricing                                                     -1%                          1%
    TiO2 sales volume                                                        14%                         11%
    TiO2 product mix                                                         -1%                         -1%
    Changes in foreign currency exchange rates                               -1%                         -3%
                                                                            ----                        ----

Total                                                                        11%                          8%
                                                                            ====                        ====