Gamma-Butyrolactone (GBL) is usually a hygroscopic colorless liquid with a weak characteristic odor. Soluble in water, GBL is a common solvent and reagent in chemistry along with being used as being a flavouring, as a cleansing solvent, being a superglue remover, and like a solvent in some wet aluminium electrolytic capacitors. GBL is just not E