L'oreal

Frank Dreher

Francis Pruche

Described is a method of reducing transcutaneous passage of an orthodiphenol oxidation dye by adding a catalytic system of Mn(II) or Zn(II) salt or oxide and at least one alkaline or alkaline earth hydrogenocarbonate to the orthodiphenol oxidation dye composition.

Coloring composition for keratin fibres comprising a system limiting the transcutaneous passage of an oxidation dye

The present invention generally relates to a hair pre-treatment anti-penetration composition comprising an efficient amount of at least one oxyethylenated copolymer. The invention also relates to a method for limiting the penetration into the skin and/or the keratin fibres of at least one dye, contained in a hair dyeing composition, involving the pre-treatment application on the hair of such an anti-penetration composition, before the hair dye process.

Oxyethylenated based hair pre-treatment anti-penetration composition and method using such a composition for limiting the penetration of dyes into the skin

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Paris, France

Frank Dreher