Fluorescence: Fluorescence Is definitely the home of a mineral to emit seen light when exposed to ultraviolet radiation. Gypsum doesn't fluoresce below UV mild. Hair or fibre and lime or clay could be added to plasters through manufacture. The plaster coats, apart from some end coats, are sanded. See also https://www.propanraya.com/id/produk/eco-gypsum-ee-4050