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5B a - RA/ Ranking and Chemical Specific (TUP/206) Chemistry and environmental safety of oxidative hair colorants. Sabaliunas, Darius1, McNeal, Atiya 2, Sabaliuniene, Inesa1, Nuck, Barb2, Gausman, Maria 2, Fendinger, Nick2, 1 Procter & Gamble Technical Centres, Egham, Surrey, United Kingdom2 The Procter & Gamble Company, Cincinnati, Ohio, United States ABSTRACT- Hair dyes are a growing category of cosmetic products, which provide a temporary through to permanent hair color creation benefit. Permanent hair colorants use oxidative chemistry based on oxidation of small dye precursor molecules in the presence of hydrogen peroxide to form larger dye species inside the hair shaft. A large array of dye precursors are used in various combinations to obtain the desired colors and shades. After product application, unreacted precursors are rinsed off down-the-drain and have the potential of entering the aquatic environment. This paper examines the environmental effects and fate of oxidative hair dyes. QSAR models, literature data, laboratory tests and field monitoring studies were used to assess the environmental properties of most common dyes. Environmental risks of the hair dyes examined in this paper were generally low, with predicted aquatic safety factors (ratio of predicted no-effect concentration and predicted environmental concentration) ranging from 5 to over 10,000. Key words: environmental risk assessment, hair dyes, down-the-drain, cosmetic |
