CANTOX Health Sciences International

New York, NY (May 12, 2006) – CIBA Expert Services, a division of CIBA Specialty Chemicals (headquartered in Basel, Switzerland; NYSE: CSB) has acquired CANTOX Health Sciences, Inc. of Mississauga, Canada. Sperry, Mitchell & Company, Inc. initiated this transaction, assisted in the negotiations and served as exclusive financial advisor to CANTOX Health Sciences

CANTOX Health Sciences, Inc. (www.cantox.com) is a leading provider of scientific and regulatory consulting services for human health and safety-related issues in over 120 countries around the world. Founded in 1985, the Company specializes in developing scientific and strategic regulatory plans, resolving complex toxicology and scientific issues, and facilitating timely regulatory approvals for clients in the food and nutrition, pharmaceutical and healthcare, chemicals, agriculture, biotech and consumer product industries. CANTOX Health Sciences will continue to provide independent scientific and regulatory consulting services under its established name.

CIBA Specialty Chemicals, Inc. (www.cibasc.com) develops and produces specialty chemicals for use in various consumer and industrial products worldwide. Founded in 1757, the Company offers services and products that add performance, protection, color, and strength to textiles, plastics, paper, automobiles, buildings, home and personal care products. CIBA Expert Services provides knowledge based services to enhance business performance, including environmental, regulatory, educational and testing services.

Sperry, Mitchell & Company (www.sperrymitchell.com) is an investment banking firm specializing in middle-market merger and acquisition advisory services. Since the firm’s founding in 1986, Sperry, Mitchell has completed over 250 transactions in a wide-range of industries, with values ranging from $10 - $450 million.