Some foods such as vegetable juice cocktails are made by mixing portions of low acid vegetables with products possessing a safe level of acidity, with a resulting potential food poisoning hazard. The control of acidity for this type of product is based on the examination of the finished product, and is determined directly as pH, which must be below 4.6. Samples of the finished product are to be submitted to the laboratory as requested.
Cal. Code Regs. Tit. 17, § 12415