KERATIN FIBRE DYEING COMPOSITION CONTAINING 2,3-DIAMINO-6,7-DIHYDRO-1H,5H-PYRAZOLO[1,2-a]PYRAZOLO-1-ONE, p-PHENYLENEDIAMINE OR p-TOLUYLENEDIAMINE AND SUBSTITUTED m-AMINOPHENOL Russian patent published in 2010 - IPC A61K8/00 A61K8/41 A61K8/49 A61Q5/10 

FIELD: medicine.

SUBSTANCE: invention refers to medicine, namely to cosmetology. The inventive subject matter is a keratin fibre dyeing composition containing at least 2,3-diamino-6,7-dihydro-1H,5H-pyrazolo[1,2-a]pyrazole-1-one as a first oxidising base, p-toluylenediamine or p-phenylenediamine as a second oxidising base, and substituted m-aminophenol of specified formula as a first condensation ingredient, bearing in mind that the mole ratio of the first condensation ingredient to the first oxidising base exceeds 1, while the mole ratio of the first oxidising base to the second oxidising base is within 0.5 to 1.5, and the mole amount of the first oxidising base is 2.5·10^-3 mole and more per 100 g of the compositions. The inventive subject matter is also dyeing technique implying application of such composition. According to the present invention, it is possible to ensure intensive, aesthetically attractive, low selective and resistant dyeing of keratin fibres with especially visible deep, red shades.

EFFECT: present invention allows ensuring intensive dyeing with neutral pH.

16 cl, 2 ex