4-5-diamino-N,N-dihydro-pyrazol-3-one derivatives for use in composition for dyeing keratin fibres

Comprising at least one or two Amino - n, the keratin material dye composition in a subject refers to one of dihydrogen pyrazoline acid derivative is as of dye composition is keratin fibre and a keratin fibre, comprising at least one or two Amino - n, n- dihydrogen pyrazoline acid derivative as the lower base, and method for producing composition. The invention claims a similarly further refers to Amino or - n, n- dihydrogen pyrazoline acid derivative or an wherein addition salt and Amino - n, n- dihydrogen pyrazoline acid derivative or an wherein a salifyings and product thereof. The invention claims a keratin fibre reliable by weight, and wherein the technology for washing and a detectable.