Copal resin is traditionally burned in protection, cleansing and purification ceremonies. The dried resin, when burned, emits an fragrance akin to frankincense but with a lighter, more citrusy tone. Traditionally heated using purpose designed charcoal discs, which are readily available.
Frankincense is sap-like resin from the leafy forest tree Boswellia Thurifera. Used mainly for purification and cleansing, ideal if you are moving into a new house and want to clear it of any residual energy.