Process and composition for the oxidative dyeing of human hair
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United States of America Patent
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Sep 9, 2003
Grant Date -
Nov 8, 2001
app pub date -
Mar 16, 2001
filing date -
Apr 1, 2000
priority date (Note) -
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Abstract
The invention concerns a process for the oxidative dyeing of human hair, whereby an aqueous composition having a pH-value between 7.0 and 12.0 is applied to the hair, wherein this Composition (AB) was obtained by admixture of an oxidation dyestuff precursor Composition (A), which comprises at least one developing and at least one coupling substance as well as at least one or more specific metal compounds, having an alkaline pH-value, with a hydrogen peroxide Composition (B), having a pH-value in the acidic range and comprising 0.05 & to 5.0% by weight, calculated to the total composition, of 1-hydroxyethane-1,1-diphosphonic acid and/or the alkali or ammonium salts thereof.
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