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Canning -- Miscellaneous
What are the "crystals" that I sometimes see in canned seafood?
Sometimes a substance that resembles glass particles appears in canned seafood. If it isn't glass, it is probably struvite - crystalline magnesium ammonium phosphate. To determine if it is struvite, place some crystals in warm vinegar. The crystal of struvite will dissolve. They are not harmful.