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See Chinese contents: GB 1886.324-2021 GB 1886.324-2021: National food safety standard - Food additives - Metatartaric acid
This Standard applies to the food additive metatartaric acid which is obtained, with tartaric acid as the raw material, by baking at 168 ~ 172 degree-Celcius for 3.5 h, or heating to 180 ~ 190 degree-Celcius, and then naturally cooled.
