Plaster of Paris, a type of calcium sulfate hemihydrate, is commonly used in various industries and applications, but it is not typically used in cosmetics. In cosmetics, ingredients are chosen for their safety, efficacy, and compatibility with the skin. Plaster of Paris is primarily used in construction, art, and medical applications, such as orthopedic casts. Face packs or masks are cosmetic products designed to be applied to the skin for various purposes such as cleansing, exfoliating, moisturizing, or providing specific skin benefits like brightening or anti-aging. These products typically contain a combination of active ingredients, thickeners, emollients, and other additives to achieve their intended effects. Some face packs may contain clays or other mineral-based ingredients that help absorb excess oil, purify pores, and improve skin texture. These ingredients are generally considered safe for use on the skin when formulated properly and used as directed.