Gamma-butyrolactone is an excipient for the painting of textile fibres and polymerisation initiator and is suitable for many applications. You should think of the removal of paint, oil, ink, enamel, glue and graffiti.Gamma-butyrolactone is an organic compound, more specifically a lactone, with the gross formula C4H6O2. The substance occurs as a colourless, oily liquid, which is low in hygroscopicity. It is a solvent and reagent in chemical reactions.