Acetylacetone is an organic compound with a molecular formula of C₅H₈O₂. It is a colorless or slightly yellowish, easy-flowing transparent liquid, with the smell of ester, and it condenses into shiny crystals when cooled. When exposed to light, it turns into a brown liquid and generates resin. Used as a solvent for cellulose acetate , organic synthesis intermediate, metal complexing agent , paint desiccant, lubricant, insecticide.