nlex23-2

We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (Nos. 33-29287 and 333-65817) of NL Industries, Inc. of our report dated March 13, 2007, relating to the consolidated financial statements, financial statement schedule, management’s assessment of the effectiveness of internal control over financial reporting and the effectiveness of internal control over financial reporting of Kronos Worldwide, Inc., which is incorporated by reference in this Form 10-K.