Optical Brightener, Brand Name : Ashten, CAS No. : 27344-41-8

Optical brighteners, also known as fluorescent whitening agents, are chemicals that enhance the appearance of whiteness and brightness in materials like textiles, paper, and plastics. They work by absorbing ultraviolet (UV) light and re-emitting it as visible blue light, which masks yellowing and makes the material appear brighter and whiter.