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Colour fastness

Colour fastness is a term used to measure the resistance to colour changes under specified conditions such as exposure to ultraviolet light, bleaching and fading.

Optical brightness or Optical Whiteners

Optical brightness or Optical Whiteners are chemicals make fabrics seem to show lighter than they do, to make them brighter they convert ultraviolet light to visible light in the blue region. They are sometimes used in the manufacture of fabrics and included in the formula of many detergents sold for home use.

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