Hair dye composition
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United States of America Patent
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May 5, 1987
Issued Date -
N/A
app pub date -
Mar 21, 1984
filing date -
Sep 3, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A composition for use in the dyeing of keratinous fibres, particularly human hair, in order to produce a true dark black color, comprises an aqueous, substantially oxygen-free solution of the dye-precursors 2-methoxy-p-phenylenediamine and 2,4-diaminophenol, the composition having a pH value of from 6 to 12. The molar concentration of one dye precursor to the other is preferably from 1:10 to 10:1, and together they form from 0.25 to 15% by weight of the composition. Optionally, the composition can also contain a detergent and/or a thickening agent.
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