is an inorganic compound with formula Ca(ClO)2
. It is the main active ingredient of commercial products called bleaching powder, chlorine powder, or chlorinated lime, used for water treatment and as a bleaching agent.
This compound is relatively stable and has greater available chlorine than sodium hypochlorite (liquid bleach
It is a white solid, although commercial samples appear yellow. It strongly smells of chlorine, owing to its slow decomposition in moist air. It is not highly soluble in hard water, and is more preferably used in soft to medium-hard water. It has two forms: dry
(anhydrous); and hydrated