| 21. | No definite relation exists between the annual rings of growth and the amount of sapwood.
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| 22. | The heartwood is moderately durable and the sapwood is liable to powder-post beetle attack.
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| 23. | The higher longitudinal permeability of sapwood of hardwood is generally caused by the presence of vessels.
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| 24. | The heartwood varies from yellowish pink through reddish brown while sapwood is generally lighter in color.
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| 25. | The sapwood is gray-yellow, whereas the heartwood is bright purple with dark stripes.
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| 26. | Wide rings are indicative of a fast-growing tree with more sapwood and not much heartwood.
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| 27. | Sapwood is concentrated along one edge of each board, and it can easily be cut off.
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| 28. | As the tree gets larger, the sapwood must necessarily become thinner or increase materially in volume.
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| 29. | The sapwood is typically cream-coloured and the heartwood has various shades of brown and purple.
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| 30. | The colour ranges from creamy white in the sapwood to a dark chocolate colour in the heartwood.
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