Which method of dyeing involves producing a water-insoluble azo dye directly on the fabric itself?
Correct answer: D. Azotic dyeing
- A. Vat dyeing
- B. Direct dyeing
- C. Disperse dyeing
- D. Azotic dyeing
Explanation
The correct answer is Azotic dyeing. This process involves a chemical reaction occurring directly on the fabric to form a water-insoluble azo dye. This method is unique as it allows for the creation of the dye on the material itself, ensuring greater fastness.Vat dyeing involves dyes that are made soluble in a vat and then applied to the fabric, not forming azo dyes directly on the fabric. Direct dyeing involves the application of water-soluble dyes without any chemical reaction on the fabric. Disperse dyeing is used for hydrophobic fibers like polyester, where dyes are dispersed in water, but does not involve forming azo dyes on the fabric.
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About Industrial Chemistry
Industrial chemistry applies chemical reactions and material properties to the manufacture of adhesives, dyes and polymers. Coverage includes addition and condensation polymerisation, thermoplastics and thermosetting polymers, the structural basis of colour in dyes, and how adhesive composition enables bonding between surfaces.
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