Resin is a highly viscous liquid that is produced when trees bleed oils in response to injury. These oils are oxidized when exposed to air, which forms the thick, sticky fluid known as resin.
The use of natural resin dates back to ancient Greece where it was commonly used as a primitive form of chewing gum for fresh breath.
Resin art uses epoxy resin which is synthetically produced to mimic the desirable properties of natural resin. Epoxy resin consists of a two-part system of synthetic polymer resin and a hardener.