Fluorescent whitening agents is a brilliant neutral shade tetra-sulphonated stilbene brightener that may be applied in the stock, at the size press or in a coating. It absorbs invisible ultraviolet radiation from daylight and emits visible, predominantly blue, fluorescent light. The importance of fluorescent whitening agents is associated with a correction of the blue deficiency of the substrate, and with the production of a white luminous effect which can be achieved in no other way.
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