Colorless solvents are liquids that are used to dissolve other substances. Two common examples of colorless solvents are acetone and acetal. Acetone is an organic compound with the chemical formula C3H6O, and it is a volatile, flammable liquid. Acetal is an organic compound with the chemical formula C5H10O2, and it is a colorless, odorless liquid. Both acetone and acetal are used in a variety of industries, including pharmaceuticals, cosmetics, and cleaning products.