Surprised it would actually stain unless one or the other (or both) were awfully damp...but, that aside, a little oxalic acid should do the trick...
Probably not - tannic acid is a very good stain. Might not be too deep, though, so sanding might be an option for you?
Not really. The frame is already stained and I don't think I can match the stain after sanding. Fortunately the discoloration is only on the edge because the frame was standing on edge when it happened.
Thanks.
Since the piece is already stained, anything that would lessen the discoloration from the walnut is likely to lighten the stain as well. I turn walnut on the lathe, and get stained hands. Only things that get it off are bleach and Oxy-Clean.
No - "vandyke crystals" are a well known stain - they're made of walnut husk extract ! You _might_ bleach it out with a hypochlorite bleach (common household bleach), but this is more likely to cause more unevenness than it solves. You can always sand it, if there's suitable access.
I'd make a weak solution of vandyke, or walnut sawdust, in water and stain the rest of the frame to match. It's a close enough colour match that oak shouldn;t look out of place with it.
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