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- Heartwood is a term used to describe the wood that is at the center of a tree.
- There are two primary categories used to depict the naturally occurring wood of a tree: heartwood and sapwood.
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★ Heartwood, also called duramen, dead, central wood of trees. Its cells usually contain tannins or other substances that make it dark in colour and sometimes aromatic.
★ Heartwood is mechanically strong, resistant to decay, and less easily penetrated by wood-preservative chemicals than other types of wood.
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