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Also known as Fluorescent Whitening Agents (FWAs), they have the property of enhancing the brightness of paper by absorbing wave lengths from the ultraviolet region of light and reflecting the same as white light giving rise to the phenomenon 'Whiter than White' This property imparted on paper by the chemical is also called fluorescence .It has become an important parameter of 'Office Papers' as they need to look brighter under the fluorescent lamps of the office. OBAs are further classified depending upon their point of application in the paper making process : Wet end, size press, coating etc.
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