Ozone.

21 C.F.R. § 184.1563
in effectEffective: 2024-07-01
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(a) Ozone (O3, CAS Reg. No. 10028-15-6) is an unstable blue gas with a pungent, characteristic odor, which occurs freely in nature, It is produced commercially by passing electrical discharges or ionizing radiation through air or oxygen. (b) The ingredient must be of a purity suitable for its intended use in accordance with § 170.30(h)(1) of this chapter. (c) In accordance with § 184.1(b)(2), the ingredient is used to treat food only within the following specific limitations:

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