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Why do salt pellets turn blue?

Updated: 11/2/2022
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16y ago

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The blue color comes from an additive that keeps evaporated salt free flowing. Normally this food grade additive would appear colorless to yellow. When the substance comes in contact with iron sulfate or dissolved iron in some hard waters, it turns blue. Not all pellets contain this additive and thus do not change color.

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Q: Why do salt pellets turn blue?
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