My home pottery studio is on a screened-in porch, so anything that can be negatively affected by freezing temperatures--e.g. wax, bagged clay, glazes--usually gets moved to the basement by early November. Sometimes even the basement isn't warm enough to prevent problems like the one presented below: crystals that precipitate out of glazes, particularly glazes that contain lithium carbonate. Given all of the ingredients sharing this particular glaze bucket, I can't say for sure what lithium compound stars in the videos, but it sure is purty.
One more quick video, because the crystal shown therein is so perfect:
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