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July 4, 2011

AZOIC DYE


Azoic or naphthol  dyes are formed in situ on the fabric through  a coupling reaction of  an aromatic alcohol or amine such as naphthol (the couplingcomponent) with a diazonium salt (the diazo component). Thedye formed contains an azo group:
 

The fabric is usually impregnated first with  the aromatic coupling component followed by immersion of the fabric in a solution  containing the diazo component,with the azoic  dye being formed  instantaneously. Owing  to the instability of  the components, the dyeings are carried out near room temperature. The dyes have moderate fastness, and dyeings may be mordanted to
increase fastness.

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