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OK, got that. Since I make my own blanks, I know how old the wood is. I also rough turn most bowls and then put them away in a drying cabinet for at least several weeks, and up to 6 months. I can probably safely say that if it says 10% on the outside (of a 1" thick rough turned bowl) it won't be more than 12-14% on the inside. At least that's what has been the case so far.