Question

Choose the correct pair:

Options

• Optical Brighteners - Reduce Yellowing

• Blues - Cause Yellowing

• Optical Brighteners - Enhance Yellow Stains

• Blues - Prevent Fabric Yellowing

Answer 1

Optical Brighteners - Reduce Yellowing

Explanation:

Optical brighteners are synthetic chemical dyes added to laundry detergents specifically to counter the natural yellowing of white fabrics over time. They work by absorbing invisible ultraviolet (UV) light from the sun and re-emitting it as visible blue light through fluorescence. This blue emission visually masks the unwanted yellow tint of the fabric, tricking the human eye into perceiving the cloth as significantly brighter and whiter.