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Metal complex dyes using copper or chromium are commonly used for producing dull colors.
Environmental concerns have now restricted their use, and they have been replaced with reactive and metal complex dyes that do not require mordant.
CIBA merged with Sandoz in 1997 to form Ciba Speciality Chemicals, leaving Clayton as a manufacturing site for metal complex dyes for wool and nylon, and pigments used for carbonless copying and thermal printer papers.