"Calcium hydroxide (traditionally known as slaked lime) is an inorganic compound with the chemical formula Ca(OH)2.

It is a colorless crystal or white powder obtained by mixing or ripening quicklime (calcium oxide) with water.

It is known by many names, including slaked lime, caustic lime, building lime, quicklime, calcium, and pickled lime. Calcium hydroxide is used in many applications, including food preparation, where it has been identified as E number E526.

Limewater, also known as milk of lime, is the common name for a saturated solution of calcium hydroxide.