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Compression wood is a type of reaction wood found on the lower sides of leaning tree trunks and branches. It is characterized by a darker color, a glassy appearance, and unevenly wider annual rings. This wood also features shorter vascular elements and excessive, uneven shrinkage compared to normal wood.1

Compression wood forms in conifers and exerts an upward pushing force, contributing to an eccentric growth pattern where the stem is more oval-shaped near the ground. This type of wood is more lignified and has reduced cellulose content. The tracheids in compression wood are rounder, with intercellular spaces and thicker walls, making the wood appear reddish.2

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