On storing, moisture and mucilaginous matter gradually settle out.
The oil which exudes is mixed with water and heated till the water boils, and the mucilaginous matter in the oil separates as a scum.
Resins when soft are known as oleo-resins, and when containing benzoic or cinnamic acid they are called balsams. Other resinous products are in their natural condition mixed with gum or mucilaginous substances and known as gum-resins.
They are then pressed in a large powerful screw-press, and the oily matter which flows out is caught, mixed with an equal proportion of water, and boiled to purify it from mucilaginous and albuminous matter.
Gelatinous or mucilaginous degenerations of cell-walls are frequently employed in the interests of spore dispersal.