heartwood

heartwood, the central, woody core of a tree, no longer serving for the conduction of water and dissolved minerals heartwood is usually denser and darker in color than the outer sapwood . Before the synthesis of aniline dyes, the heartwood of several tropical trees (sold collectively under the commercial name brazilwood ) was used to produce blue, purple, and red dyes. As a tree becomes older, the heartwood increases in diameter, whereas the sapwood remains about the same thickness. See wood .

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.

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The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.