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184.1315 Ferrous sulfate.
（a Ferrous sulfate heptahydrate （iron （II sulfate heptahydrate, FeSO47H2O, CAS Reg. No. 7782C63C0 is prepared by the action of sulfuric acid on iron. It occurs as pale, bluish-green crystals or granules. Progressive heating of ferrous sulfate heptahydrate produces ferrous sulfate （dried? Ferrous sulfate （dried consists primarily of ferrous sulfate monohydrate （CAS Reg. No. 17375C41C6 with varying amounts of ferrous sulfate tetrahydrate （CAS Reg. No. 20908C72C9 and occurs as a grayish-white to buff-colored powder.
（b The ingredients meet the specifications of the Food Chemicals Codex, 3d Ed. ?981? p. 123 （Ferrous sulfate heptahydrate and p. 124 （ferrous sulfate, dried? which is incorporated by reference. Copies are available from the National Academy Press, 2101 Constitution Ave., NW., Washington, DC 20418, or available for inspection at the National Archives and Records Administration （NARA? For information on the availability of this material at NARA, call 202C741C6030, or go to:http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html.
（c In accordance with184.1（b）（1? the ingredients are used in food as nutrient supplements as defined in170.3（o）（20 of this chapter and as a processing aid as defined in 170.3（o）（24 of this chapter, with no limitation other thancurrent good manufacturing practice. The ingredients may also be used in infant formula in accordance with section 412（g of theFederal Food, Drug, and Cosmetic Act（the act ?1 U.S.C. 350a（g）） or with regulations promulgated under section 412（a）（2 of the act ?1 U.S.C. 350a（a）（2））.
（d Prior sanctions for these ingredients different from the uses established in this section do not exist or have been waived.
[53 FR 16866, May 12, 1988]
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