Chuna (also known as lime or calcium oxide) is commonly used in Hindu pooja (worship) for purification purposes. It is believed to have cleansing properties and is used to purify the surroundings and the items used in the pooja,Chuna is also used to purify the body and mind of the individuals involved in the pooja. It is applied to the forehead of the worshippers as a tilak (a mark), which is believed to have a cooling effect and help in concentration,chuna is an important ingredient in Hindu pooja and is used for its purifying and cleansing properties