42.
    发明专利
    未知

    公开(公告)号:IT8023344D0

    公开(公告)日:1980-07-09

    申请号:IT2334480

    申请日:1980-07-09

    Applicant: OREAL

    Abstract: The invention relates to hair-dyeing compositions based on para-phenylenediamine. These compositions contain, as the oxidation dyestuff, para-phenylenediamine and one or more para-phenylenediamines of the formula in which R denotes alkyl or hydroxyalkyl and R' denotes a hydroxyalkyl group, and also their cosmetically acceptable salts, in a molar ratio para-phenylenediamine/compound(s) of the formula (I), expressed in terms of free bases, which is such that, after the addition of an equal volume of hydrogen peroxide of 20 volumes strength and application to the hair for 30 minutes, no Bandrowsky's base is detected in the oxidizing dyeing composition. These compositions make it possible to obtain natural background colorations, ranging from black to light chestnut, of very good quality.

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