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Cake day: September 19th, 2022

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  • Hmm, this kind of stuff is usually a result of water acting as a solvent pulling salts and similar substances from a substrate and later evaporating, leaving the powder behind.

    It is probably something that was used to treat the plywood or a combination of that with the zinc coating of the metal (zinc-sulfate?).

    Edit: probably sodium-borate, as that seems to be prone to leaching from wood treated with it.