Section 184.1297 - Ferric chloride(a) Ferric chloride (iron (III) chloride, FeC13, CAS Reg. No. 7705-08-0) may be prepared from iron and chlorine or from ferric oxide and hydrogen chloride. The pure material occurs as hydroscopic, hexagonal, dark crystals. Ferric chloride hexahydrate (iron (III) chloride hexahydrate, FeC13. 6H20, CAS Reg. No. 10025-77-1) is readily formed when ferric chloride is exposed to moisture.(b) The ingredient must be of a purity suitable for its intended use.(c) In accordance with § 184.1(b)(1) the ingredient is used in food as a flavoring agent as defined in § 170.3(o)(12) of this chapter, with no limitation other than current good manufacturing practice.(d) Prior sanctions for this ingredient different from the uses established in this section do not exist or have been waived.53 FR 16864, May 12, 1988, as amended at 73 FR 8607 , Feb. 14, 2008