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Gypsum is CaSO4, calcium sulfate. Calcium and sulfate aid in mushroom metabolism by providing looseness and mineral salts. But lowers pH by a half point to a point. Primarily? I am not very familiar with drywall, what else is in it?
I always thought calcium sulfate was used to help even out moisture -- I guess it might be used for calcium, though. "Calcinating" isn't a really good word for it, but that's what it's called. It's a bit of a dessicant -- when you heat it, or "calcinate" it it loses some of it's water. It starts off as a dihydrate and ends up as a hemihydrate:
CaSO4 + 2H20 --heat--> CaSO4 + 1/2 H20
.. or 1 H20 for every two molecules. Once heat activated (calcinated) it can gain the water back that it lost. I think people use the dihydrous gypsum for mushrooms.
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