Lime Chuna Powder, commonly known as Chuna or slaked lime, is a fine white powder derived from calcium hydroxide (Ca(OH)â‚‚). It is traditionally used in various cultural, culinary, and construction practices, particularly in South Asia. Key Characteristics: Chemical Composition: Calcium hydroxide (Ca(OH)â‚‚) Appearance: A fine, white to off-white powder Odor: Odorless Solubility: Slightly soluble in water, where it forms a milky suspension known as limewater. It is more soluble in acids, forming calcium salts. Common Uses: Culinary Use: In South Asia, Chuna is sometimes used in small amounts in betel quid (paan) preparation. It is mixed with areca nut, betel leaf, and other ingredients.