Where Are Direct Dyes Used

Direct dyes are used on cotton, paper, leather, wool, silk and nylon. Chemicals Nature of Direct Dyes: Chemically they are salts of complex sulfonic acids.

What is direct dye?

Direct dyes are water soluble dyes which have an affinity for fibres. Both congo red and martius yellow are direct dyes. Give the diazotisation reaction of aniline.

What is direct dye with example?

Direct dyes usually contain sulfo groups and are readily soluble in water. A typical example of a direct dye is direct light blue: … Direct dyes are used for cotton fibers, viscose, leather, and paper; to a lesser degree, they are used for natural silk, wool, and polyamide fibers.