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E331 is the European code used to refer to any of the three kinds of sodium citrate (sodium salts of citric acid): monosodium citrate (NaH2C6H5O7), disodium citrate (Na2HC6H5O7) or trisodium citrate (Na3C6H5O7). They are used as food additives, usually for flavour or as a preservative.
- Harry Potter and the Deathly Hallows: Part 1 (Mentioned on product label)
- Harry Potter Limited Edition (Mentioned on product label)