Which trees can produce resin?
Gum, in short, is actually a kind of secretion of trees. When the trees are injured, the wound secretes a thick gum fluid that promotes healing. Gum gradually dry in the air, will form a solid shape, crisp, transparent or translucent, with water swelling or plastic melting into a viscous colloidal solution, in ethanol or most organic solvents are not dissolved, very difficult to clean up. And almost all trees produce gum, which is inevitable.
Resin usually refers to softening or melting range after heating. When softening, it tends to flow under external force. At normal temperature, it is solid, semi solid, and sometimes liquid organic polymer. Broadly speaking, any polymer compound that can be used as plastic material for processing raw materials is called resin.
Resin is a plastic product, not a knot on a tree.
