Question

Explain any two types of dyes based on their method of application.

Answer 1

Direct Dyes:

• They have a high affinity for cotton, rayon and other cellulose fibre.

• So they are applied directly as they fix firmly on the fabric.
  Example: Congo red.

Vat Dyes:

• It can be used only on cotton and, not on silk and wool.

• This dyeing is a continuous process and is carried out in a large vessel called a vat.

• So it is called a Vat dye.
  Example: Indigo