| http://www.w3.org/ns/prov#value | - It can be desirable for the salt, the transition metal, and the counterion to be either on the U.S. Food and Drug Administration GRAS (generally regarded as safe) list, or exhibit substantially no migration from the packaging article to the product (i.e. less than about 500 ppb, such as less than about 50 ppb, in the product).
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