Fluorescence: Fluorescence Will be the residence of a mineral to emit seen light-weight when subjected to ultraviolet radiation. Gypsum does not fluoresce under UV gentle. Hair or fibre and lime or clay may be extra to plasters during manufacture. The plaster coats, except for some end coats, are sanded. See https://www.propanraya.com/id/produk/eco-gypsum-ee-4050