- 1,4-diamino-5-chloro-2-nitrobenzene derivatives, processes for their production and compositions containing the same for the coloration of hair
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New 1,4-diamino-5-chloro-2-nitrobenzene derivatives are disclosed of the formula I STR1 Wherein R1 and R2 are the same or different and are each hydrogen, 2-hydroxyethyl or 2,3-dihydroxypropyl, with the proviso, that at least one of said R1 and R2 is 2,3-dihydroxypropyl, along with processes for their production, as well as hair coloring compositions containing the same and methods of coloring hair. The compounds are red- to violet-coloring direct dyes, and are readily soluble in water, with favorable toxicological characteristics.
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