Noun
One who or that which brightens.
A chemical agent that absorbs ultraviolet and violet light and re-emits blue light by fluorescence, used to make fabric or paper look whiter.
(metallurgy) Any substance added to an electrolytic bath to yield a brighter electroplated surface.
Source: en.wiktionary.orgA white surface treated with an optical brightener can emit more visible light than that which shines on it, making it appear brighter. Source: Internet
Excess brightener will often cause a greening effect as emissions start to show above the blue region in the visible spectrum. Source: Internet
One application is to formulas for washing and conditioning grey or blonde hair, where the brightener can not only increase the luminance and sparkle of the hair, but can also correct dull, yellowish discoloration without darkening the hair. Source: Internet
Some advanced face and eye powders contain optical brightener microspheres that brighten shadowed or dark areas of the skin, such as "tired eyes". Source: Internet
If you can get two, it’s best to use a corrector first and a brightener on top. Source: Internet
In the evening, you can continue with the skin brightener, or you may want to add a retinol product to help increase skin turnover and improve skin healing. Source: Internet