O-aminophenol sulfates (inci)

O-Aminophenol sulfate is a substance used as a permanent hair dye in cosmetic formulations. Permanent hair dyes cause a coloration of the hair matrix (hair keratin). O-aminophenol sulfate belongs to the colorless oxidation bases used for permanent hair dyeing. These are easily oxidizable, initially colorless dye bases. Principle: The dye bases migrate into the hair shaft swollen by the alkaline medium. There they are oxidized to complex dyes, whereby they chemically bind with the hair keratin. Only through the oxidation of the (colourless) dye bases by the hydrogen peroxide the actual dye is formed.