Agent and process for dyeing and tinting keratinous fibres

This application is a national stage application under 35 U.S.C. §371 of international application PCT/EP97/02280 filed May 5, 1997, the international application not being published in English. Formulations for coloring keratinous fibers are provided, comprising a substantive dye, an aminopolycarboxylic acid or salt thereof with a physiologically compatible cation, and isoascorbic acid or a salt thereof with a physiologically compatible cation. Also provided are methods of coloring keratinous fibers with the formulations.