|    Name of Corporation                                                           |  Jurisdiction Of Incorporationor Organization | % of VotingSecurities Held at December 31, 2010 (1) |
|-------------------------------------------------------------------------------------------------|---------------------------------------------------------|----------------------------------------------------------|
|                                                                                            |                                                    |                                                     |
| Amcorp, Inc.ASC Holdings, Inc.                                                                  | DelawareUtah                                            | 100%100%                                                 |
|             Amaltex, Inc.                | Texas                                                   | 100%                                                     |
|                                                                                            |                                                    |                                                     |
| Andrews County Holdings, Inc.Waste Control Specialists LLC                                      | DelawareDelaware                                        | 100%100%                                                 |
|                                                                                            |                                                    |                                                     |
| Kronos Worldwide, Inc. (2)                                                                      | Delaware                                                |  50%                                                |
|                                                                                            |                                                    |                                                     |
| NL Industries, Inc. (2), (3), (4)                                                               | New Jersey                                              |  83%                                                |
|             CompX International Inc. (4) | Delaware                                                |  87%                                                |
|                                                                                            |                                                    |                                                     |
| Tremont LLC                                                                                     | Delaware                                                | 100%                                                     |
| TRECO L.L.C.                                                                                    | Nevada                                                  | 100%                                                     |
| Basic Management, Inc.                                                                          | Nevada                                                  |  32%                                                |
| Basic Water Company                                                                             | Nevada                                                  | 100%                                                     |
| Basic Environmental Control LLC                                                                 | Nevada                                                  | 100%                                                     |
| Basic Power Company                                                                             | Nevada                                                  | 100%                                                     |
| Basic Remediation Company LLC                                                                   | Nevada                                                  | 100%                                                     |
| Basic Land Company                                                                              | Nevada                                                  | 100%                                                     |
|        The Landwell Company LP                               | Delaware                                                |  50%                                                |
|   The Landwell Company LP                                                             | Delaware                                                |  12%                                                |
| TRE Holding Corporation                                                                         | Delaware                                                | 100%                                                     |
|   TRE Management Company                                                              | Delaware                                                | 100%                                                     |
| Tall Pines Insurance Company                                                                    | Vermont                                                 | 100%                                                     |
|                                                                                            |                                                    |                                                     |
| Medite Corporation                                                                              | Delaware                                                | 100%                                                     |
|                                                                                            |                                                    |                                                     |
| Impex Realty Holding, Inc.                                                                      | Delaware                                                | 100%                                                     |

| (1) | Held by the Registrant or the indicated subsidiary of the Registrant. |
|-----|-----------------------------------------------------------------------|

| (2) | Subsidiaries of Kronos are incorporated by reference to Exhibit 21.1 of Kronos’ Annual Report on Form 10-K for the year ended December 31, 2010 (File No. 333-100047).  NL owns an additional 30% of Kronos directly. |
|-----|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| (3) | Subsidiaries of NL are incorporated by reference to Exhibit 21.1 of NL's Annual Report on Form 10-K for the year ended December 31, 2010 (File No. 1-640). |
|-----|------------------------------------------------------------------------------------------------------------------------------------------------------------|

| (4) | Subsidiaries of CompX are incorporated by reference to Exhibit 21.1 of CompX's Annual Report on Form 10-K for the year ended December 31, 2010 (File No. 1-13905). |
|-----|--------------------------------------------------------------------------------------------------------------------------------------------------------------------|