Fluorescence: Fluorescence Will be the residence of a mineral to emit obvious light when subjected to ultraviolet radiation. Gypsum will not fluoresce beneath UV gentle. Hair or fibre and lime or clay could possibly be additional to plasters during manufacture. The plaster coats, aside from some end coats, are sanded. https://www.propanraya.com/id/produk/eco-gypsum-ee-4050