Naphthols and Bases
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Naphthols and Bases:-
The dyes belonging to this class are not "ready made" dyes, but are formed in the fibre substance by the dyer of printer in textile mills from two components, usually called naphthols (azoic diazo components). The coloured substance formed from these components is insoluble in water. The pigment thus formed contains an azo group and hence it is called and " azoic pigment". During the formation of the pigment, diazotisation of the base is used, in which ice is required and, therefore, these pigment are also called 'ice colours'.
