Exhibit 99.1

Rockwood Reports Second Quarter 2013 Results

Highlights

·                  Adjusted EBITDA - $166 million versus $221 million primarily attributable to weak Titanium Dioxide Pigments performance

·                  Adjusted EPS - $0.73 per share versus $1.24 per share

·                  Entered into definitive agreements on June 14th to sell our Advanced Ceramics business for EUR 1.49 billion and on July 26th to sell our Clay-based Additives business for USD 635 million

·                  Repurchased 1.96 million shares at an average price of $64.89 per share

Princeton, New Jersey; August 5, 2013 — Rockwood Holdings, Inc. (NYSE: ROC) today reported net income of $32.3 million, or $0.41 per share for the second quarter of 2013, which included other net charges of $25.5 million, primarily related to the non-core business sales process, particularly Advanced Ceramics and Clay-based Additives, as compared to $224.9 million, or $2.81 per share for the same period in the prior year, which included other net benefits of $125.8 million, primarily related to the reversal of a majority of our federal tax valuation allowance.

Excluding these other net charges and benefits, adjusted net income was $57.8 million, or $0.73 per share, in the second quarter of 2013 compared to $99.1 million, or $1.24 per share, for the same period in the prior year. Quarter on quarter performance was down primarily due to Titanium Dioxide Pigments, which more than offset improved results from Surface Treatment, the Advanced Ceramics medical business and Lithium.

For the six months ended June 30, 2013, net income was $51.2 million, or $0.64 per share, which included other net charges of $61.0 million, as compared to $300.7 million, or $3.76 per share for the prior year, which included other net benefits of $103.0 million.

Excluding these other net charges and benefits, adjusted net income was $112.2 million, or $1.41 per share, in the six months ended June 30, 2013, versus $197.7 million, or $2.47 per share for the same period in the prior year.  Year on year performance was lower from weak results from Titanium Dioxide Pigments, partially offset by improved results from Surface Treatment, Lithium and the Advanced Ceramics medical business.

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Free cash flow for the second quarter 2013 was $19.8 million compared to $39.0 million in same period in the prior year. The second quarter benefited from significant improvement in working capital offset by lower earnings, higher cash taxes, cash interest and capital expenditures. Capital expenditures were higher largely due to the expansion of our lithium carbonate facility in Chile.

Table 1: Second Quarter and YTD Financial Highlights

Seifi Ghasemi, Chairman and Chief Executive Officer, commented, “Our core Lithium and Surface Treatment business segments performed well within expectations, delivering improved quarter on quarter Adjusted EBITDA performance and strong margins of 39% and 23%, respectively.  These results however, were overshadowed, as we had indicated on our April 30 first quarter earnings call, by continued weak performance from the Titanium Dioxide Pigments business.  Our Performance Additives segment did not perform to our expectations due to a slow recovery in consumer discretionary spending for remodeling activities and weaker starts of new homes impacted by both economic and adverse weather conditions in the US.

We have made significant progress in implementing our stated goal to divest non-strategic businesses by entering into definitive agreements to sell our Advanced Ceramics and Clay-based Additives businesses at very attractive multiples.”

Business Segment Review

Second quarter and year-to-date net sales and Adjusted EBITDA results, as compared with the same period a year ago, are summarized below:

Table 2: Net Sales

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Table 3: Adjusted EBITDA

(a) The constant currency effect is the translation impact of the change in the average rate of exchange of another currency to the U.S. dollar for the applicable period as compared to the preceding period. The impact primarily relates to the conversion of the Euro to the U.S. dollar. For the three and six months ended June 30, 2013 and 2012, the average rate of exchange of the Euro to the U.S. dollar is $1.31 and $1.28, respectively, and $1.31 and $1.30, respectively.  For further details, see Appendix Table A-1.

Second Quarter Segment Drivers

Lithium: Net Sales and Adjusted EBITDA increased 0.9% and 1.9%, respectively.

·                  Net sales and Adjusted EBITDA increased primarily from higher volumes of lithium carbonate, lithium hydroxide and specialty salts, partially offset by lower selling prices and lower volumes for potash and battery products.

Surface Treatment: Net Sales and Adjusted EBITDA increased 4.0% and 11.3%, respectively.

·                  Net sales increased primarily due to higher selling prices and increased volumes, particularly driven by higher automotive OEM and general industrial applications.

·                  Adjusted EBITDA increased from higher net sales and lower raw material costs, partially offset by higher selling, general and administrative costs.

Performance Additives: Net Sales decreased 6.1%, while Adjusted EBITDA increased 2.6%.

·                  Net sales decreased primarily due to lower volumes from timber treatment chemicals, coatings applications and construction in Europe in Color Pigments and Services, partially offset by higher volumes from North American oil and natural gas drilling and improved construction volumes in the U.S.

·                  Adjusted EBITDA improved slightly primarily due to favorable fixed cost absorption, lower distribution and freight costs and lower selling, general and administrative costs, partially offset by lower net sales.

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Titanium Dioxide Pigments: Net Sales increased 30.3%, while Adjusted EBITDA decreased 117.3%.

·                  Net sales benefited from higher volumes due to the acquisition of certain crenox GmbH assets in July 2012 and improved demand in most applications, partially offset by lower selling prices.

·                  Adjusted EBITDA decreased primarily from lower selling prices and continued lower fixed cost absorption related to lower production levels to reduce inventory, partially offset by improved volumes.

Discontinued Operations — Advanced Ceramics: Net Sales and Adjusted EBITDA increased 5.0% and 4.0%, respectively.

·                  Net sales and Adjusted EBITDA increased primarily from higher volumes of medical ceramics.

Outlook

Commenting on the outlook, Mr. Ghasemi said, “For the second half of the year, we expect our Lithium and Surface Treatment businesses to continue to show growth and maintain strong margins. Further, we believe that our Titanium Dioxide business will achieve a turn-around with Adjusted EBITDA margins trending in excess of 10%.”

Mr. Ghasemi added, “And with a key priority of maximizing shareholder value, we will continue with our unrelenting focus on evaluating all of our options with respect to the remaining non-strategic businesses.”

Conference Call and Webcast

On Monday, August 5, 2013 at 11:00 am EDT, Rockwood Holdings plans to host its conference call and webcast to discuss these results.

To access this conference call, the dial-in number in the U.S. is (800) 553-5260, and the international dial-in number is (612) 332-7516. No access code is needed for either call. A listen-only, live webcast of the conference call will also be available at www.rocksp.com. Materials for the call, including the earnings release and presentation, will be available for download on the company’s website on the morning of the call. For persons unable to listen to the live conference call or webcast, a webcast replay of the call will be available on Rockwood’s website.

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Rockwood Holdings, Inc. is a leading global specialty chemicals and advanced materials company. Rockwood has a worldwide employee base of approximately 10,200 people and annual net sales of $3.5 billion in 2012. Rockwood focuses on global niche segments of the specialty chemicals, pigments and additives and advanced materials markets. For more information on Rockwood, please visit www.rocksp.com.

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Non-GAAP Financial Measures

This press release includes “non-GAAP financial measures,” such as, a discussion of Adjusted EBITDA, net sales including sales from discontinued operations, free cash flow and net income/diluted earnings per share excluding certain items. Adjusted EBITDA is not intended to be an alternative to net income as an indicator of operating performance or to cash flows from operating activities as a measure of liquidity. Additionally, Adjusted EBITDA is not intended to be a measure of free cash flow for management’s discretionary use, as it does not consider certain cash requirements such as interest payments, tax payments and debt service requirements. All presentations of consolidated Adjusted EBITDA are calculated using the definition set forth in the Company’s senior secured credit agreement as a basis and reflects management’s interpretations thereof.  Adjusted EBITDA, which is referred to under the senior secured credit agreement as “Consolidated EBITDA,” is defined in the senior secured credit agreement as consolidated earnings (which, as defined in the senior secured credit agreement, equals income (loss) before the deduction of income taxes of Rockwood Specialties Group, Inc. and the Restricted Subsidiaries (as such term is defined in the senior secured credit agreement), excluding extraordinary items) plus certain items including interest expense, depreciation expense, amortization expense, extraordinary losses and non-recurring charges, losses on asset sales, less certain items including extraordinary gains and non-recurring gains, non-cash gains and gains on asset sales.  We use Adjusted EBITDA on a consolidated basis to assess our operating performance, to calculate performance-based cash bonuses and determine whether certain performance-based options and restricted stock units vest (as such bonuses, options and restricted stock units are tied to Adjusted EBITDA), and as a liquidity measure. In addition, we use Adjusted EBITDA to determine compliance with our debt covenants. We also use Adjusted EBITDA on a segment basis as the primary measure used by our chief operating decision maker to evaluate the ongoing performance of our business segments and reporting units. A reconciliation of net income attributable to Rockwood Holdings, Inc. shareholders to Adjusted EBITDA is contained in this press release. We strongly urge you to review the reconciliation. In addition, we discuss sales growth in terms of nominal (actual) and net change (nominal less constant currency impacts).

Net sales including sales from discontinued operations is not intended to be an alternative for net sales. Management believes that net sales including sales from discontinued operations is meaningful to investors because it provides a view of the Company with respect to its operating results.

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Free cash flow is not intended to be an alternative to cash flows from operating activities as a measure of liquidity. Our presentation of free cash flow is defined as net cash from operating activities, less capital expenditures, net of proceeds from government grants received, and other items (including, among others, the cash impact of adjustments made to Adjusted EBITDA under our senior secured credit agreement). Management believes that free cash flow is meaningful to investors because it provides an additional measure of liquidity. However, a limitation of free cash flow is that it does not represent the total increase or decrease in cash during the period. An additional limitation associated with the use of this measure is that the term “free cash flow” does not have a standardized meaning. Therefore, other companies may use the same or a similarly named measure but exclude different items or use different computations, which may provide investors a comparable view of our performance in relation to other companies. Management compensates for this limitation by presenting the most comparable GAAP measure, net cash provided by operating activities of continuing operations, with free cash flow within its earnings release and by providing a reconciliation that shows and describes the adjustments made. A reconciliation of net cash provided by operating activities to free cash flow is provided in the accompanying tables.

Neither net income excluding certain items nor diluted earnings per share excluding certain items is intended to be an alternative for net income or diluted earnings per share. Management believes that net income and diluted earnings per share excluding certain items is meaningful to investors because it provides a view of the Company with respect to ongoing operating results.

Reconciliations of these non-GAAP financial measures are included herein. These non-GAAP measures should not be viewed as an alternative to GAAP measures of performance. Furthermore, these measures may not be consistent with similar measures provided by other companies.

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This press release contains, and management may make, certain “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. All statements other than statements of historical facts may be forward-looking statements.  Words such as “may,” “will,” “should,” “could,” “likely,” “anticipates,” “intends,” “believes,” “estimates,” “expects,” “forecasts,” “plans,” “projects,” “predicts” and “outlook” and similar words and expressions are intended to identify forward-looking statements. Examples of our forward-looking statements include, among others, statements relating to our outlook, our future operating results on a segment basis, our future Adjusted EBITDA and free cash flows, our share repurchase plans and our strategic initiatives.  Although they reflect Rockwood’s current expectations, they involve a number of known and unknown risks, uncertainties and other factors that could cause actual results to differ materially from those expressed or implied, and not guarantees of future performance. These risks, uncertainties and other factors include, without limitation, Rockwood’s business strategy; changes in general economic conditions in North America and Europe and in other locations in which Rockwood currently

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does business; competitive pricing or product development activities affecting demand for Rockwood’s products; technological changes affecting production of Rockwood’s materials; fluctuations in interest rates, exchange rates and currency values; availability and pricing of raw materials; governmental and environmental regulations and changes in those regulations; fluctuations in energy prices; changes in the end-use markets in which Rockwood’s products are sold; hazards associated with chemicals manufacturing; Rockwood’s ability to access capital markets; Rockwood’s high level of indebtedness; risks associated with competition and the introduction of new competing products, especially from the Asia-Pacific region; risks associated with international sales and operations; risks associated with information securities and the risks, uncertainties and other factors discussed under “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in Rockwood’s Form 10-K for the year ended December 31, 2012 and other periodic reports filed with or furnished to the Securities and Exchange Commission. Rockwood does not undertake any obligation to publicly update or revise any forward-looking statement, whether as a result of new information, future events or otherwise.

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Rockwood Holdings, Inc. and Subsidiaries

Condensed Consolidated Statements of Operations

(Dollars in millions, except per share amounts; shares in thousands)

(Unaudited)

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Rockwood Holdings, Inc. and Subsidiaries

Condensed Consolidated Balance Sheets

(Dollars in millions, except per share amounts; shares in thousands)

(Unaudited)

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Rockwood Holdings, Inc. and Subsidiaries

Condensed Consolidated Statements of Cash Flows

(Dollars in millions)

(Unaudited)

(a) Net of government grants of $1.5 million and $7.6 million for the six months ended June 30, 2013 and 2012, respectively.

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Appendix Table A-1: Segment Net Sales and Adjusted EBITDA