Dyeing composition for keratinous fibres containing at least one co-solubilized n-substituted 2-nitro-para-phenylenediamine and process for dyeing keratinous fibres therewith
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United States of America Patent
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Jun 5, 1990
Grant Date -
N/A
app pub date -
Aug 9, 1985
filing date -
Aug 13, 1984
priority date (Note) -
Expired
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Abstract
The invention relates to a dyeing composition for keratinous fibres containing, in a suitable vehicle, at least one 2-nitro-para-phenylenediamine direct dye, in free or salified form and also at least one xanthine derivative of formula (II) ##STR1## where n=0 or 1, R'.sub.3 =H, R'.sub.1, R'.sub.2, R'.sub.4 and R'.sub.5 are substituents having various significances, the said compound of formula (II) being in free or salified form. They can be used for dyeing hair.
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