Calcium hydroxidecalcium hydroxide), an inorganic compound with the chemical formulaCa(OH)2Commonly known as slaked lime or hydrated lime, it is a white powdery solid. When added to water, it separates into two layers: the upper aqueous solution is called clear limewater, and the lower suspension is referred to as milk of lime or lime slurry. The clear limewater in the upper layer can be used to test for carbon dioxide, while the turbid liquid in the lower layer, milk of lime, is a building material. Calcium hydroxide is a strong alkali with bactericidal and preservative properties, and it has a corrosive effect on skin and fabrics. Calcium hydroxide is widely used in industry. It is a common building material and is also used as a bactericide and chemical raw material.