Casting SALT like Metal - What Happens?

Can salt actually be melted and cast like metal? In this experiment, I melt pink Himalayan salt and table salt in a furnace and kiln, then try casting it into molds using the same process I normally use for metal. The results were not what I expected, especially when comparing kiln casting vs sand casting.

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Casting equipment
PetroBond https://amzn.to/4bZJqsJ
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3d printing FDM
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3d printing Resin
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Belt Grinder Accessories
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Welding
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Metal finishing tools
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General
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Some of my favorite tools of the year
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Camera Equipment
Canon 6d II https://amzn.to/4erxUbi
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