Oxidative hair dyeing method, composition, and kit utilizing hydroxyl substituted benzothiazines
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United States of America Patent
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Dec 20, 1994
Grant Date -
N/A
app pub date -
Dec 27, 1993
filing date -
Dec 27, 1993
priority date (Note) -
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Abstract
A process of dyeing hair by preparing and applying to the hair an aqueous reaction medium comprising dihydroxybenzothiazine and a periodsate, iodate, ferricyanide or persulfate oxidizing agent, the composition optionally containing a color modifier selected from the group consisting of direct dyes, primary intermediates, couplers, cysteine, dopa species and mixtures thereof, additionally containing a buffer to maintain the pH in the range from 2 to 11 during the oxidation reaction; and removing the aqueous reaction medium from the hair after the desired color is attained and compositions and kits for practicing such processes. The reaction medium may be formed by simultaneous addition of the benzothiazine and the oxidant to the hair or by addition of the benzothiazine followed addition of the oxidant.
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