Optical brighteners also called fluorescent whitening agents (FWAs) are hydrophilic water-soluble compounds that can absorb UV light and emit visible (blue violet) light. They are mainly anionic diamino stilbene (DAS) or distyrylbiphenyl (DSBP) derivatives displaying a low aquatic toxicity. Optical Brightener https://polymer-stabilizer.alfa-chemistry.com/products/optical-brightener.html
