Optical brighteners, also known as fluorescent whitening agents (FWAs) or optical brightening agents (OBAs), are chemical compounds used to enhance the whiteness and brightness of materials. Here are some of their main uses:
1. *Textiles and Clothing*: Optical brighteners are used in laundry detergents to make clothes appear whiter and brighter by reflecting blue light, which counteracts yellowing. They're also used in fabric manufacturing to enhance fabric brightness.
2. *Paper Industry*: Optical brighteners are added to paper pulp to increase the whiteness and brightness of paper products, such as printing paper, tissue paper, and packaging materials.
3. *Plastics and Polymers*: Optical brighteners are used to improve the appearance of plastics by making them appear brighter and more vibrant.