Question

The colourless dyes which make white fabric appear whiter and brighter are called ______.

Options

• Starches

• Blues

• Optical brighteners

• Detergents

Answer 1

The colourless dyes which make white fabric appear whiter and brighter are called optical brighteners.

Explanation:

Optical brighteners are colourless dyes that absorb ultraviolet light and re-emit it as visible blue light, making white fabrics appear brighter and whiter.