Agent for the oxidative dyeing of hair, method for the preparation of the agent and use of the agent
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United States of America Patent
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Feb 12, 1991
Grant Date -
N/A
app pub date -
Apr 14, 1988
filing date -
Aug 21, 1986
priority date (Note) -
Expired
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Abstract
In a method for the oxidative dyeing of human or animal hair a hair dyeing agent is prepared from at least one oxidation dye in creme or gel form, which is adjusted to a pH of 5.9 to 6.9. The preparation is performed with the addition of at least one metal salt as catalyst, which is added simultaneously with or immediately after the mixing of the oxidation dye with the oxidizing agent, the amount added being such that it is contained in the treatment-ready hair dyeing agent in proportions between 0.001 and 1.00 wt.-%, preferably between 0.0004 and 0.001 wt.-%. The metal salts used as catalyst are preferably selected from the group containing copper(II) chloride, copper(II) sulfate, cobalt chloride, cerium sulfate and vanadium sulfate.
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