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In page Incense:

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Indirect-burning incense, also called "non-combustible incense",[1] is an aromatic material or combination of materials, such as resins, that does not contain combustible material and so requires a separate heat source. Finer forms tend to burn more rapidly, while coarsely ground or whole chunks may be consumed very gradually, having less surface area. Heat is traditionally provided by charcoal or glowing embers. In the West, the best known incense materials of this type are the resins frankincense and myrrh,[citation needed] likely due to their numerous mentions in the Bible. Frankincense means "pure incense",[2] though in common usage, it refers specifically to the resin of the boswellia tree.[3]