Ethanol (100%), also known as absolute alcohol, is a colorless, flammable liquid commonly used as a solvent, disinfectant, and cleaning agent in laboratories. It is used for sterilizing surfaces, preserving biological samples, and as a reagent in chemical reactions., Ethanol (100%) is typically supplied in various grades, including reagent grade and denatured alcohol. It should be stored in a well-ventilated area away from heat and ignition sources.