Locke Liddell & Sapp LLP
                             Attorneys & Counselors
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                                                                     EXHIBIT 5.1

                                  June 6, 2006


Kronos International, Inc.
5430 LBJ Freeway, Suite 1700
Dallas, Texas 75240

     Re: Kronos International, Inc. Registration Statement on Form S-4

Ladies and Gentlemen:

     We have acted as special counsel to Kronos International,  Inc., a Delaware
corporation  (the  "Company"),  in connection  with the public  offering of euro
400,000,000  aggregate  principal  amount of the Company's 6 1/2% Senior Secured
Notes due 2013  (the  "Exchange  Notes").  The  Exchange  Notes are to be issued
pursuant  to an  exchange  offer (the  "Exchange  Offer") in  exchange  for like
principal  amounts of the issued and outstanding 6 1/2% Senior Secured Notes due
2013 of the Company (the "Original Notes") under an Indenture, dated as of April
11, 2006 (the "Indenture"), by and between the Company and The Bank of New York,
as  Trustee  (the  "Trustee"),   as  contemplated  by  the  Registration  Rights
Agreement,  dated as of April 11, 2006 (the  "Registration  Rights  Agreement"),
between the Company and Deutsche Bank AG London.

     This opinion is being furnished in accordance with the requirements of Item
601(b)(5) of Regulation  S-K under the  Securities  Act of 1933, as amended (the
"Act").

     In  connection  with this opinion,  we have  examined  originals or copies,
certified or otherwise  identified to our satisfaction,  of (i) the Registration
Statement on Form S-4 (Registration No. 333-123680) as filed with the Securities
and Exchange Commission (the "Commission") under the Act on the date hereof (the
"Registration  Statement");  (ii) an executed  copy of the  Registration  Rights
Agreement;  (iii) an executed copy of the  Indenture;  (iv) the  Certificate  of
Incorporation of the Company;  (v) the Bylaws,  as amended,  of the Company,  as
currently in effect;  (vi) certain  resolutions of the Board of Directors of the
Company relating to the Registration  Rights Agreement,  the Exchange Offer, the
issuance of the Original Notes and the Exchange Notes, the Indenture and related
matters;  (vii) the Form T-1 of the  Trustee;  (viii)  the form of the  Exchange
Notes and (ix) such other  documents as we have deemed  necessary or appropriate
as a basis for the opinions set forth herein. We have also examined originals or
copies,  certified or otherwise identified to our satisfaction,  of such records
of  the  Company  and  such  agreements,   certificates  of  public   officials,
certificates of officers or other  representatives of the Company and such other
statements,  documents,  certificates  and corporate or other records as we have
deemed necessary or appropriate as a basis for the opinions set forth herein.

     In our  examination,  we have  assumed  the legal  capacity  of all natural
persons,  the genuineness of all signatures,  the  authenticity of all documents
submitted  to us as  originals,  the  conformity  to original  documents  of all
documents   submitted  to  us  as  certified  or  photostatic   copies  and  the
authenticity  of  the  originals  of  such  latter  documents.   In  making  our
examination  of executed  documents,  we have assumed that the parties  thereto,
other than the Company, had or will have the power, corporate or other, to enter
into and  perform  all  obligations  thereunder  and have also  assumed  the due
authorization  by all requisite  action,  corporate or other,  and execution and
delivery by such parties of such  documents and the validity and binding  effect
on such parties. As to any facts material to the opinions expressed herein which
were not  independently  established  or  verified,  we have relied upon oral or
written statements and representations of the Company and others.

     We are admitted to the bar in the State of Texas, and we do not express any
opinion as to the laws of any other  jurisdiction other than the federal laws of
the  United  States of  America,  the  General  Corporation  Law of the State of
Delaware,  the Business  Corporation Law of the State of New York, the statutory
provisions of Delaware and New York law,  applicable  provisions of the Delaware
and New York  Constitutions and reported judicial  decisions  interpreting those
laws,  and we  express  no  opinion  as to the  effect of any other  laws on the
opinions stated herein.

     Based upon the  foregoing and subject to the  limitations,  qualifications,
exceptions and assumptions set forth herein, we are of the opinion that:

     When (i) the  Registration  Statement,  including any  amendments  thereto,
becomes  effective  under  the Act,  and (ii) the  Exchange  Notes  (in the form
examined by us) have been duly executed and authenticated in accordance with the
terms of the Indenture and have been issued and delivered upon  consummation  of
the Exchange  Offer against  receipt of Original  Notes  surrendered in exchange
therefor in accordance with the terms of the Exchange Offer,  the Exchange Notes
will constitute  valid and binding  obligations of the Company,  entitled to the
benefits of the  Indenture,  and  enforceable  against the Company in accordance
with their  terms,  except  that the  enforcement  thereof  may be subject to or
limited by (1) bankruptcy,  insolvency,  reorganization,  moratorium, fraudulent
conveyance  or other  similar  laws  now or  hereafter  in  effect  relating  to
creditors' rights generally and (2) general  principles of equity (regardless of
whether such enforceability is considered in a proceeding at law or in equity).

     In  rendering  the  opinions  set forth  above,  we have  assumed  that the
execution and delivery by the Company of the  Indenture  and the Exchange  Notes
and the performance by the Company of its obligations thereunder do not and will
not  violate,  conflict  with or  constitute  a default  under any  agreement or
instrument to which the Company or any of its properties is subject,  except for
those  agreements and  instruments  governed by the laws of the United States or
any state  thereof  that  have been  identified  to us by the  Company  as being
material  to it and  that  have  been  filed  as  exhibits  to the  Registration
Statement.

     We hereby  consent to the filing of this opinion with the  Commission as an
exhibit to the Registration  Statement.  We also consent to the reference to our
firm under the caption "Legal  Matters" in the prospectus  that is filed as part
of the Registration  Statement.  In giving this consent, we do not thereby admit
that we are "experts" within the meaning of Section 11 of the Act or included in
the category of persons whose consent is required  under Section 7 of the Act or
the rules and regulations of the Commission.

                                                     Very truly yours,

                                                     LOCKE LIDDELL & SAPP LLP



                                                     By: /s/ Toni Weinstein
                                                         -----------------------
                                                         Toni Weinstein