|    Name of Corporation                                  |  Jurisdiction      Of Incorporationor Organization | %      of VotingSecurities      Held at December 31, 2009 (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                                                     |  59%                                                          |
|                                                                   |                                                         |                                                               |
| 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 LandCompany                                                      | 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% 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, 2009 (File No.      333-100047).  NL owns an additional 36% 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, 2009 (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, 2009 (File No.      1-13905). |
|-----|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|