gum streak

gum vein, gum pocket, gum streak

In hardwoods, a local accumulation or streak of resin.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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"One of the wood's key attributes is its uniform, light color, [whereas] other maple species often display substantially different tones between heartwood and sapwood along with mineral or gum streaks."