Fluorescence: Fluorescence May be the house of a mineral to emit visible gentle when subjected to ultraviolet radiation. Gypsum won't fluoresce beneath UV light-weight. Hair or fibre and lime or clay can be additional to plasters through manufacture. The plaster coats, except for some end coats, are sanded. See also https://www.propanraya.com/id/produk/eco-gypsum-ee-4050