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Novel heterocyclic acid and mordent acid dyes were synthesized by the  coupling of diazonium salt solution of different aromatic amines with 2-  butyl-3-(4-hydroxybenzoyl)benzofuran. The resulting heterocyclic acid dyes  were characterized by spectral techniques, i.e., elemental analysis, IR,  1HNMR, 13C-NMR spectral studies and UV- visible spectroscopy. The dyeing  performance of all the heterocyclic acid dyes was evaluated on wool and silk  fabrics. The dyeing of chrome pre treated wool and silk fabrics showed better  hues on mordented fabrics. Dyeing of wool and silk fabrics resulted in  pinkish blue to red shades with very good depth and levelness. The dyed  fabrics showed excellent to very good light, washing, perspiration,  sublimation and rubbing fastness

Synthesis, characterization and dyeing behavior of heterocyclic acid dyes and mordent acid dyes on wool and silk fabrics