DYE COMPOSITION OF ACIDIC PH COMPRISING 2,3-DIAMINO-6,7-DIHYDRO-1H,5H-PYRAZOLO1,2-APYRAZOL-1-ONE, A PARA-PHENYLENEDIAMINE, A META-AMINOPHENOL AND AN OXIDIZING AGENT

摘要

A composition for dyeing keratin fiber is provided to allow the keratin fiber to be colored into red, copper or mahogany with strong resistance against various attacking factors to hair such as shampoo, light, sweat and perming under acidic pH. A composition for dyeing keratin fiber having a pH of 5.5-7.5 comprises at least one first oxidation base selected from the group consisting of 2,3-diamino-6,7-dihydro-1H,5H-pyrazolo[1,2-a]pyrazol-1-one represented by a formula(1) and an addition salt thereof, at least one second oxidation base selected from para-phenylene diamine, at least one coupler selected from meta-aminophenol, and at least one oxidizing agent in an appropriate dyeing medium. A method for dyeing the keratin fiber comprises the steps of: (a) applying the composition to the fiber for a time enough for coloring the fiber to a desired color; and (b) after rinsing off the fiber, drying it.