Calcium hydroxide (traditionally called slaked lime or hydrated Lime) is an inorganic compound with the chemical formula Ca(OH)2.  It is widely used in synthesis of medical drug, food additive, hi-tech biological material HA, VC phosphonolipide used as feed additive, food arum, calcium agent, additive for candy manufacturing industry of calcium naphthenate, calcium lactate and calcium citrate, water processing.