What is Resin?
[[File:Resin with insect (aka).jpg|thumb|upright|Insect trapped in resin]] [[File:Résine.jpg|thumb|upright|Resin of a pine]] [[File:Rosin.jpg|thumb|A cake of rosin can be used by [[violin]]ists or for [[soldering]]]] '''Resin''' is a mixture of [[organic compound]]<nowiki/>s [[secretion|secreted]] by many [[plant]]s, especially [[Conifer|coniferous trees]]. Plants [[evolved]] many complex chemicals as [[defence against herbivory|defences against herbivores]]. That may be the origin of these resins, which are certainly not good to eat. Plants secrete resins for their protective benefits in response to injury. The resin protects the plant from insects and pathogens.<ref>{{cite web|url=http://www.fs.fed.us/wildflowers/ethnobotany/resins.shtml|title=Resins|website=www.fs.fed.us}}</ref> Resins confound a wide range of herbivores, insects, and pathogens. The volatile [[phenol|phenolic compounds]] may attract benefactors, that is, [[parasitoid]]s or predators of the herbivores which attack the plant.<ref>Langenheim, Jean 2003. ''Plant resins: chemistry, evolution, ecology, and ethnobotany''. Timber Press, Portland OR.</ref> Humans also value resins for their many uses. They are used in [[varnish]]es, [[adhesive]]s, as raw materials for [[organic synthesis]], or for [[incense]] and [[perfume]]. [[Fossil]]ized resins are the source of [[amber]]. The term is also used for synthetic substances with similar properties. Resins contain chemicals composed of carbon, hydrogen, oxygen, nitrogen and sulfur. Synthetic resins are used in laminates, adhesives, flooring, linings, etc.<ref>{{Cite web|last=|first=|date=|title=Resin Bonded Stone|url=https://resinbondedstone.uk/|archive-url=|archive-date=|access-date=2020-11-01|website=Resin Bonded Stone|language=en-GB}}</ref> == Rosin == '''Rosin''', (also called 'colophony' or 'Greek pitch') is a solid form of resin. It is got from [[pine]]s and some other [[plant]]s, mostly [[Pinophyta|conifers]]. Heating fresh liquid resin vaporizes light [[volatiles]] like [[terpene]]s. R