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(b) * * *
(1) Synthetic iron oxide for human food use shall conform to the following specifications:
Arsenic (as As), not more than 3 milligrams per kilogram (mg/kg) (3 parts per million (ppm)).
Lead (as Pb), not more than 5 mg/kg (5 ppm).
Mercury (as Hg), not more than 1 mg/kg (1 ppm).
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(c) * * *
(1) Synthetic iron oxide may be safely used for human food use subject to the following restrictions:
(i) In sausage casings intended for human consumption in an amount not exceeding 0.10 percent by weight of the finished food.
(ii) In soft and hard candy, mints, and chewing gum at levels consistent with good manufacturing practice, except that it may not be used to color foods for which standards of identity have been issued under section 401 of the Federal Food, Drug, and Cosmetic Act, unless the use of the added color is authorized by such standards.
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