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So should I look for wood that's been down a while? This might be a struggle on the ground sitting in the woods, but there's hundreds of acres of woods to pick from where I'm heading.
Or (at the risk of sounding dumb with this idea) could you put said stump in a plastic mattress storage bag made of plastic, in theory a sealed air tight environment and monitor the relative humidity a while before putting it out in the summer sun?
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That may result in an awesome piece of spalted wood. Woodturners will pay nice money for good solid spalted wood.
Seal the end grain, so the wood can lose moisture slowly though the edges, instead of fast through end grain. It will probably still end up checking, and you will probably tire of waiting for a big section of green wood to dry like this anyway. Face the fact that it will check and use it anyways.
Besides "Make a Chair From a Tree", there are a couple other books about green woodworking you might want to get and read. Drew Langsner also has a Book that I think is called "Green Woodworking"