Tributyltin (TBT) is jargon for organotin compounds that contain the (C4H9)3Sn group, such as tributyltin hydride or tributyltin oxide. For 40 years, TBT was used as a biocide in anti-fouling paint, commonly known as bottom paint. Antifouling paint improves ship performance and durability, because it prevents or slows the growth of organisms that ...