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  • is this a byproduct of the pressure treatment or just plain old mold like I suspect it is?

    Yes. It's a chemical treatment residue; the stuff that's forced in to the wood fibres when it's pressure treated. It disappears over time.

  • It disappears over time, and the wood warps to fuck.

    ftfy

    Any of the big box stuff I've bought has been literally dripping with tanalith.

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