Section 184.1265 - Cuprous iodide(a) Cuprous iodide (copper (I) iodide, CuI, CAS Reg. No. 7681-65-4) is a pure white crystalline powder. It is prepared by the reaction of copper sulfate with potassium iodide under slightly acidic conditions.(b) The ingredient must be of a purity suitable for its intended use.(c) In accordance with § 184.1(b)(2) , the ingredient is used in food only within the following specific limitations: | Category of food | Maximum treatment level in food | Functional use |
| Table salt | 0.01 percent | Source of dietary iodine. |
(d) Prior sanctions for this ingredient different from the uses established in this section do not exist or have been waived.49 FR 24119, June 12, 1984, as amended at 73 FR 8607 , Feb. 14, 2008