Fluorescent whitening agents are designed to absorb light in the ultraviolet range, usually in the range of 340-370 nm, and then reemit it in the blue region of the visible spectrum, typically around 430 nm. This results in a brighter, more vibrant white appearance to the plastic.

Optical Brightener Masterbatch Master is typically added to the base polymer during processing, and it is commonly used in applications where a bright, white appearance is desired, such as in food packaging, cosmetic packaging, and consumer goods. It can be used in a variety of plastic resins, including polypropylene, polyethylene, and PET.