Ethanol, 95%, laboratory grade, contains ethanol, denaturants, and water. The ethanol includes the denaturants and, therefore, is not pure ethanol. The percentage of denaturants in the ethanol varies, but usually accounts for 10% of the solution. Laboratory Grade—Intermediate purity.
Ethanol has a number of uses in microbiology. It is used in the purification and precipitation of biomolecules, in staining and restaining specimens in histology, in dehydrating tissues before embedding, and in disinfection. There are three grades of ethanol commonly used in the lab.