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Patent Picks—Hair and Eyelash Growth, Fixatives, Surfactants and More
By: Rachel Grabenhofer, Cosmetics & Toiletries magazine
Posted: November 9, 2010
page 6 of 6
Mixture of sulfide dyes
US Patent 7828858
Publication date: Nov. 9, 2010
Assignee: Ciba Corp.
The present patent discloses mixtures of sulfide dyes and dyeing compositions comprising mixtures of sulfide dyes. The mixtures are useful for the dyeing of organic materials such as keratin fibers, preferably human hair. The technical challenge is to provide dyes that are distinguished by deep dyeing and having good fastness properties with respect to washing, light, shampooing and rubbing.