A discoloration in any species of wood caused by mineral deposits the tree extracts from the soil. Commonly seen as a blackish-blue streak within the grain.
Discoloration in lumber caused by chemical oxidation of minerals naturally occurring in the wood.
Naturally occuring wood areas caused by minerals extracted from the soil. The streaks appear as blackish-blue, well-defined and run parallel with the grain, and are not considered a defect.
Darkened or discolored wood areas caused by minerals which the tree extracts from the soil. Mineral streaks appear as blackish-blue, well-defined streaks running parallel with the grain (commonly found in maple, cherry and oak).
Discoloration, often brown, black or green in tone.
Wood containing an accumulation of mineral matter introduced by sap flow causing an unnatural color ranging from greenish brown to black.
A general term used to describe discoloring of hardwoods. The discoloring ranges from greenish brown to black, and has a high mineral content. (The natural discoloration within the wood.)