Brightener
Brighteners (also called optical brighteners or OBAs – Optical Brightning Agents) are chemical compounds used in the printing industry to improve the brightness and whiteness of paper. They absorb UV light and emit it as visible blue light, giving the paper a ‘brighter’ and ‘fresher’ white tone. This effect increases the brilliance of printed products, making the paper look whiter and more valuable. Optical brighteners are used in paper production, but brighteners are also used in printing inks to increase contrast and colour intensity, particularly in photo and colour printing. …