Question
Question: Which of the following is a vat dye and often used in dyeing jeans...
Which of the following is a vat dye and often used in dyeing jeans
A
Indigo
B
Alizarin
C
Picric acid
D
Crystal violet
Answer
Indigo
Explanation
Solution
Vat dyes are insoluble compounds which up on reduction give soluble (lencoform) product. The product may be either coloured or colourless and have affinity for specific fabrics e.g. Indigo.