42983-80-2Relevant academic research and scientific papers
Oxidative hair dye compositions
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, (2008/06/13)
Oxidative hair dye composition containing as "para component" compounds of the formula: SPC1 Or their acid addition salts, in which: R1 is alkyl or hydroxyalkyl; R2 is hydrogen or hydroxyalkyl; R3 is hydrogen, alkyl, alkoxy or halogen; and R4 occupies any one of the remaining positions on the benzene radical and is hydrogen, alkyl, alkoxy or halogen; providing that R2 is hydrogen when R3 is alkyl, alkoxy or halogen and providing that at least two of R1, R2, R3 or R4 are other than hydrogen.
