Abstract Process for the dyeing of human hair utilizing an aqueous solution containing from 0.1 to 5 percent by weight of dyes for application to hair, including living human hair, which contain as active components, a 3-substituted pyrazolone and an aromatic bi- or polyfunctional amine having at least one primary amino group and another functional group in para-position, or else a 4aminopyrazolone. These dyes are applied in aqueous solution or preferably in the form of an aqueous cream or emulsion and may contain thickeners, grooming agents, perfumes. They may be in the form of a shampoo. Application to the hair is carried out at temperatures of 15* to 40* C., preferably at room temperature, and the time required is approximately 20 to 25 minutes. The dyes, in contrast to conventional ones, can be removed from the hair with reducing agents.
An aqueous composition for the dyeing of human hair containing from 0.1 to 5 percent by weight of a mixture of component (a) and component (b) in substantially equimolar amounts, said component (a) being a pyrazolone of the formula
Claim 3
Dependent Claim
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4-aminopyrazolones of the formula
Claim 4
Dependent Claim
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water soluble acid addition salts of said 4-aminopyrazolones.
Claim 5
Dependent Claim
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The aqueous composition for the dyeing of human hair of claim 2 wherein said composition has a further content of from 0.5 to 30 percent by weight of a surfactant.
Claim 6
Dependent Claim
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water-soluble acid addition salts of said 4-aminopyrazolones.
Claim 7
Dependent Claim
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The aqueous composition for the dyeing of human hair of claim 2 wherein said composition has a further content of from 0.1 to 25 percent by weight of thickeners.
Claim 8
Dependent Claim
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The aqueous composition for the dyeing of human hair of claim 2 wherein said composition has a further content of an effective amount of a chemical oxidizing agent.
Claim 9
Dependent Claim
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The process of claim 1 wherein said oxidative dyestuff mixture of component (a) and component (b) is present in an amount of from 0.1 to 2 percent by weight.