The natural, untreated cotton in tampons readily absorbs chemicals commonly used in toilet paper, laundry detergents and shampoos. These chemicals – known as optical brighteners -are used to enhance whites and brighten colours, and show up under ultra-violet (UV) light, a phenomenon often seen in glowing t-shirts under certain lighting in bars and clubs.
Read the original here:
Glow in the dark tampons identify sewage pollution in rivers