<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (October 2008) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (October 2008) (Learn how and when to remove this template message) </Td> </Tr> <P> Adhesive tape refers to any one of a variety of combinations of backing materials coated with an adhesive . Different backing materials and adhesives can be used depending on the intended use . </P> <P> Pressure - sensitive adhesive (PSA), a key component of some adhesive tapes, was first developed in 1845 by Dr. Horace Day, a surgeon . In 1901, the German Oscar Troplowitz invented an adhesive patch called Leukoplast for the German company Beiersdorf AG . In 1936, German company Beiersdorf AG invented a transparent adhesive patch called Tesa . </P>

What is the sticky stuff on tape made out of