What are Naphthol dyes?

What are Naphthol dyes?

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 dyes; the application are complex while the range of colors is limited.

Azoic combinations are still the only class of dyes that offer very deep orange, red, scarlet and bordeaux shades with excellent light and washing fastness.The pigments produced have bright colors, but there are no greens or bright blues. Rubbing fastness varies with shades but washing fastness is equal to Vat dyes, generally with less light fastness than Vat dyes.

Tianjin Leading Import and Export Co., Ltd. offers a series of Naphthol dyes listed as below: