Some sap is sweet and edible — think maple syrup. Other sap is known mostly because of the thick, sticky resin it contains. The tree uses this resin to seal off insects and other damage. Some trees, ...

is a reddish resin extracted from Commiphora trees. The process of extracting sap from Boswellia and Commiphora trees is virtually identical. Incisions, or taps, are made in the bark of the tree ...