Chuna is an edible lime, also known as calcium hydroxide, that is used as an ingredient in paan, a popular South-Asian edible. Raja Chuna is a specific type of chuna that is often used as the first ingredient in making paan, forming the base coat of the betel leaf. It is added in very small quantities and is also an ingredient in supari and lime chutney. Raja Chuna is made from lime and water, and only the best quality calcium hydroxide is used to make it. It is best stored in a cool and dry place. Raja Chuna is available for purchase in paste form, such as Lotus Lime - Pan Chuna Dabbi - Sunnambu - Edible Chuna Paste, or in powder form, such as Raja Chuna sold by Shri Swami Industries. It is also available for purchase on websites such as Paan Corner and Ekirana.nl.