The invention concerns compounds derived from diaminopyrazole of formula (I), wherein: R1 is a linear or branched radical selected among C2, C3, C4 aminoalkyl radicals or C2, C3, C4 aminoalkenyl radicals, or one of the physiologically acceptable salts thereof. The invention also concerns compositions containing said compound for dyeing keratinous fibers and the method using said compositions. ##STR1##

 
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