Tannins, Gary. The same kind of natural dyes found in red wine. I agree with you that the type of wood you describe would be the best to use.
However, go for it Ryan! I can't see any reason why your plan wouldn't work. Were you able to find any additional info from others who have used found wood? There's got to be lots of them...
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Yeah, well, you know, that's just, like, your opinion, man.
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