**Exhibit 31.1**

 

**CERTIFICATIONS**

 

I, Seifi Ghasemi, certifythat:

 

| 1.                                                                                                                                                                                                                                                       |   | I have reviewed this  quarterly report on Form10-Q of Rockwood Holdings, Inc.;                                                     |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|-----------------------------------------------------------------------------------------------------------------------------------------|
|                                                                                                                                                                                                                                                     |   |                                                                                                                                    |
| 2.                                                                                                                                                                                                                                                       |   | Based on my knowledge,  this report does not contain any untrue statement of a material fact or omit  to state a material fact          |
| necessary to make the  statements made, in light of the circumstances under which such statements  were made, not misleading with respect to the period covered by this report;                                                                          |
|                                                                                                                                                                                                                                                     |   |                                                                                                                                    |
| 3.                                                                                                                                                                                                                                                       |   | Based on my knowledge,  the financial statements, and other financial information included in this  report, fairly present in all       |
| material respects the  financial condition, results of operations and cash flows of the registrant  as of, and for, the periods presented in this report;                                                                                                |
|                                                                                                                                                                                                                                                     |
| 4.                                                                                                                                                                                                                                                       |   | The registrant’s other  certifying officer(s) and I are responsible for establishing and  maintaining disclosure controls and |
| procedures (as defined  in Exchange Act Rules13a-15(e)and 15d-15(e)) for the registrant and have:                                                                                                                                                        |
|                                                                                                                                                                                                                                                     |   |                                                                                                                                    |
| (a)                                                                                                                                                                                                                                                      |   | Designed such  disclosure controls and procedures, or caused such disclosure controls and  procedures to be designed under              |
| our supervision, to  ensure that material information relating to the registrant, including its  consolidated subsidiaries, is made known to us by others within those entities,  particularly during the period in which this report is being prepared; |
|                                                                                                                                                                                                                                                     |   |                                                                                                                                    |
| (b)                                                                                                                                                                                                                                                      |   | Designed such internal  control over financial reporting, or caused such internal control over  financial reporting, to be              |
| designed under our  supervision, to provide reasonable assurance regarding the reliability of  financial reporting and the preparation of financial statements for external  purposes in accordance with generally accepted accounting principles;       |
|                                                                                                                                                                                                                                                     |
| (c)                                                                                                                                                                                                                                                      |   | Evaluated the  effectiveness of the registrant’s disclosure controls and procedures and  presented in this report our conclusions  |
| about the effectiveness  of the disclosure controls and procedures, as of the end of the period  covered by this report based on such evaluation; and                                                                                                    |
|                                                                                                                                                                                                                                                     |   |                                                                                                                                    |
| (d)                                                                                                                                                                                                                                                      |   | Disclosed in this  report any change in the registrant’s internal control over financial  reporting that occurred during the       |
| registrant’s most  recent fiscal quarter that has materially affected, or is reasonably likely  to materially affect, the registrant’s internal control over financial  reporting;                                                             |
|                                                                                                                                                                                                                                                     |
| 5.                                                                                                                                                                                                                                                       |   | The registrant’s other  certifying officer(s)and I have disclosed, based on our most recent  evaluation of internal control over   |
| financial reporting, to  the registrant’s auditors and the audit committee of the registrant’s board  of directors (or persons performing the equivalent functions):                                                                           |
|                                                                                                                                                                                                                                                     |   |                                                                                                                                    |
| (a)                                                                                                                                                                                                                                                      |   | All significant  deficiencies and material weaknesses in the design or operation of internal  control over financial reporting          |
| which are reasonably  likely to adversely affect the registrant’s ability to record, process,  summarize and report financial information; and                                                                                                      |
|                                                                                                                                                                                                                                                     |
| (b)                                                                                                                                                                                                                                                      |   | Any fraud, whether or  not material, that involves management or other employees who have a  significant role in the                    |
| registrant’s internal  control over financial reporting.                                                                                                                                                                                            |
|                                                                                                                                                                                                                                                          |        |                                                                                                                                         |  |

 

 
| Date: August 6,  2008            |   |
|---------------------------------------|--------|
|                                  |   |
| /s/ SEIFI GHASEMI                |   |
| Seifi Ghasemi                         |   |
| Chairman and Chief  Executive Officer |   |

 

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