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heartwood
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Only light wood was included in these samples; the chemistry of dark heartwood or disease-stained wood is known to be quite different from light wood.
In the space frame, struts are made of peeler cores - the thin cylinders of heartwood remaining on the lathes after their long blades peel off plywood veneers from logs.
They're a nice, knot-free heartwood , meaning that there's no outer layer of sapwood on it.
The two oldest individuals at Caffey Hill both contained decayed heartwood , so stand maximum ages exceeded these values.
Construction Common, Deck Common, Merchantable Heart and Merchantable are knotty garden grades of redwood and offer a colorful mix of sapwood and heartwood .
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