DYEING COMPOSITION HAVING ACID PH VALUE AND INCLUDING 2,3-DIAMINO-6,7-DIHYDRO-1H,5H-PYRAZOLO[1,2-a] PYRAZOL-1-ON, PARA-PHENYLENEDIAMINE, META-AMINOPHENOL AND OXIDISER Russian patent published in 2009 - IPC A61K8/49 A61K8/41 A61K8/23 A61Q5/10 

FIELD: cosmetology.

SUBSTANCE: invention refers to cosmetology, and namely to keratin fibre dyeing composition, and particularly keratin fibres of a man, such as hair, which includes at least one base to be oxidated first, which is chosen from 2,3-diamino-6,7-dihydro-1H,5H-pyrazolo[1,2-a]pyrazol-1-on of formula (I) and its additive salts, at least one base to be oxidated second, which is chosen from para-phenylenediamines, at least one combination agent chosen from meta-aminophenols, and at least one oxidiser; and which has pH value within 5.5-7.5.

EFFECT: present invention allows dyeing keratin fibres with bright shades of red, copper colour and mahogany, which are seen good enough on natural or dyed hairs and are uniformly distributed throughout the hair length from roots to ends.

16 cl, 1 ex