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Old 04-12-2019, 11:27 AM
Shawn Everette Shawn Everette is offline
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I've never had great success with Spruce as a casting glass. You can do it, but devit is common, and it tends to look cordier.

To avoid devit in any situation you're going to want to crash the kiln after your high temp soak down to your anneal. I'm not sure what the devit temp is for Spruce, but most kiln glasses you're looking in the 1250-1350 range. You also might have more success with a pre filled mold and either spruing or topping off. If the devit temp is around your casting temp, the more it has to move, and the longer you leave it there, the more it will crystallize.

I also know that in some situations certain colors are going to be more prone to devit.
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