Soap and detergent - Optical brighteners | Britannica
Soap and detergent - Soap and detergent - Optical brighteners: Now an integral part of all washing powders, optical brighteners are dyestuffs absorbed by textile fibres from solution but not subsequently removed in rinsing. They convert invisible ultraviolet light into visible light on the blue side of the spectrum, causing the fibre to reflect a greater proportion of visible light and making ...
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