| abstract |
1320250 Hair dyeing PROCTER & GAMBLE CO 9 Nov 1971 [9 Nov 1970] 51978/71 Heading D1B Hair is dyed by treating with a solution containing 0.01ppm to 500ppm of an oxidase enzyme selected from laccase, lactate oxidase, glucose oxidase, galactose oxidase, L-2 hydroxyacid oxidase, aldehyde oxidase, monoamine oxidase, and urate oxidase, and from 0.001% to 6% by weight of an aromatic compound which is a primary oxidation dye precursor, (as defined) in the presence of oxygen (e.g. air or H 2 O 2 ) at a pH of 4 to 10 and being free from mixtures of aromatic amines or derivatives thereof with polyhydric phenols or derivatives thereof. Preferably the hair is treated with the dye precursor before the enzyme is added. The solution is preferably aqueous and secondary oxidation dye precursors as defined may also be employed. |