Optical Brighteners are chemicals that are primarily used to impart whiteness to Paper, Plastic, Textiles, and Detergents. They are available in either Liquid or Powder form. They are compounds that absorb light from the ultraviolet and violet regions of the Electromagnetic Spectrum and re-emit the same light in the Blue region of the Electromagnetic Spectrum by a process known as Fluorescence. Fluorescence is a process in which short light emissions take place, spanning small periods of time. Optical Brighteners are synthesized using various chemicals like Triazine Stilbenes, Coumarins, Imidazolines, Diazoles, Triazoles, Benzoxazolines, and Biphenyl Stilbenes. Cyanuric Chloride is one of the chemicals used in Optical Brighteners that is used as a precursor and cross-linking agent in Sulphonated Triazine-Stilbene based Optical Brighteners.
Optical Brighteners are generally used to brighten colours and to mask yellowing of lacquers, paints, inks, plastics, photo-processing solutions, and fibres. Other applications of Optical brighteners include in Moulded Thermoplastics, Films and Sheets, Synthetic Leather, and Ultraviolet Tracers. Substrates like Cellulose, Nylon, Silk, Wool, Paper, Detergents, Soaps, Plastics, Coatings, and, Polymers. The Kolocron range of Optical Brighteners are used for bleaching of Cotton, Silk, Polyamide, Paper, Pulp, Detergents, Waste Paper, Bamboo Wood, and Cellulose. The Benetox range of Optical Brighteners are used in Screen Printing applications. The Textile Industry has major applications for Optical Brighteners.