Strange Stains on White Oak
On my most recent project, I noticed some black stains appear during milling. The stained area intensified as I milled more. Of about 15 boards, about 4 have a few stained areas. The stains were adjacent to the grain, which suggests that the stains are not naturally occurring in the grain. From the surface, I couldn't tell which boards would have stains. Occurred on 4/4 and 8/4.
See the attached photos. Is this a known phenomenon or did I get a freak batch?
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