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Naphthol dyes are insoluble azo dyestuffs that are produced on the fiber by
applying a Naphthol to the fiber and then combining it with a diazotized base
or salt at a low temperature to produce an insoluble dye molecule within the
fiber. Naphthol dyes are classified as fast dyes, usually slightly cheaper than
Vat dyeings; the methods of application are complex and the range of colors
limited.

Azoic combinations are still
the only class of dye that can produce very deep orange, red, scarlet and
Bordeaux shades of excellent light and washing fastness.The pigments produced
have bright colors, and include navies and blacks, but there are no greens or
bright blues. Crocking fastness varies with shades but washing fastness is
equal to Vat dyeings, generally with less light fastness than the Vats.

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