Abstract WHEREIN R1 is a member selected from the group consisting of hydrogen, -CONH2, -COOH, -COOR'', alkyl having 1 to 10 carbon atoms, phenyl and nicotinoyl; R'' represents an alkyl having 1 to 4 carbon atoms; and R2 is a member selected from the group consisting of hydrogen, alkyl having 1 to 10 carbon atoms, phenyl and p-sulfonamidophenyl; and (b) a coupling component, said developer component compound being present in substantially equimolar to a slight excess with respect to said coupling component compound. In the process of dyeing the living human hair which comprises treating the hair at a temperature of from 15* C. to 40* C. with an aqueous composition for dyeing human hair comprising an oxidation dyestuff and customary dyestuff adjuvants in the presence of an oxidizing agent, and thereafter rinsing the hair, the improvement which comprises utilizing as said oxidation dyestuff, from 0.1 percent to 5 percent by weight of an oxidation dyestuff combination of (a) a developer component compound having the formula
The process of claim 1 wherein said oxidative dyestuff combination is present in an amount of from 0.1 percent to 2 percent by weight.
Claim 2
Dependent Claim
98 words
In the process of dyeing living human hair which comprises treating the hair at a temperature of from 15* C. to 40* C. for a time sufficient to effect dyeing with an aqueous composition for dyeing human hair comprising an oxidation dyestuff and customary dyestuff adjuvants in the presence of a chemical oxidizing agent and thereafter rinsing the hair, the improvement which comprises utilizing as said oxidation dyestuff, from 0.1 percent to 5 percent by weight, based on the total aqueous composition, of an oxidation dyestuff combination of 4-aminopyrazolone-3-carboxylic acid amide hydrochloride and resorcinol in substantially equimolar amounts.
Claim 3
Dependent Claim
96 words
In the process of dyeing living human hair which comprises treating the hair at a temperature of from 15* C. to 40* C. for a time sufficient to effect dyeing with an aqueous composition for dyeing human hair comprising an oxidation dyestuff and customary dyestuff adjuvants in the presence of a chemical oxidizing agent and thereafter rinsing the hair, the improvement which comprises utilizing as said oxidation dyestuff, from 0.1 percent to 5 percent by weight, based on the total aqueous composition, of an oxidation dyestuff combination of 3-nicotinoyl-4-amino-pyrazolone hydrochloride and a-naphthol in substantially equimolar amounts.