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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Apr 9, 1991
Grant Date -
N/A
app pub date -
Apr 14, 1988
filing date -
Aug 21, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a method for the oxidative dyeing of human or animal hair a hair dyeing agenet 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 alkali metal salt or alkaline earth 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 0.0001 and 1.00 wt.-%, preferably between 0.0004 and 0.001 wt.-%.
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