Definitions for "Optical brightener"
fluorescent dyes added to paper to enhance the visual brightness
A colourless dye which is added to the fiber stock or applied to the paper surface at the size press to enhance its brightness.
A Substance That Is Added To An Uncoloured Or A Coloured Textile Material To Increase The Apparent Reflectance In The Visible Region By Conversion Of Ultra-violet Radiation Into Visible Light And So To Increase The Apparent Brightness Or Whiteness. Also Termed Fluorescent Brightener; Optical Whitener; Fluorescent Whitening Agent; Brightening Agent