Representative para-aminophenols which can be used, for example, include those para-aminophenols corresponding to formula (IV) below, and the addition salts thereof with an acid: [0072] wherein: [0073] R13 is chosen from a hydrogen atom, a halogen atom such as fluorine, and C1-C4 alkyl, C1-C4 monohydroxyalkyl, (C1-C4)alkoxy(C1-C4)alkyl, C1-C4 aminoalkyl, and hydroxy(C1-C4)alkylamino(C1-C4)alkyl ra