I have a friend who's been harvesting and air-drying Claro walnut. The dry slabs look okay, but when I cut into them, there are light-colored streaks inside. The bleached-out areas are not visible on the surface of the slab. They become evident only when some of the surface is removed. In the first photo, you can see an area where I've planed off just a smidge, and the walnut is normal color. Lower in the photo, you can see where I've planed off a deeper cut, and the bleached areas appear. The bleached areas are not sap wood. In the second photo, you can see sap wood near to the bark. It is a different color and grain texture from the bleached areas.
If it makes any difference, the slabs are 2 1/2" thick, and have air-dryed in California's Central Valley for three years. In the summer, they regularly see daytime highs of a hundred degrees, and relative humidity below 20 percent.
Does anybody know what's going on here?
And does anybody know what to do to not have it happen in the future?
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