Section 146.148 - Reduced acid frozen concentrated orange juice(a) Reduced acid frozen concentrated orange juice is the food that complies with the requirements for composition and label declaration of ingredients prescribed for frozen concentrated orange juice by § 146.146 , except that it may not contain any added sweetening ingredient. A process involving the use of anionic ion-exchange resins permitted by § 173.25 of this chapter is used to reduce the acidity of the food so that the ratio of the Brix reading to the grams of acid, expressed as anhydrous citric acid, per 100 grams of juice is not less than 21 to 1 or more than 26 to 1.(b) The name of the food is "Reduced acid frozen concentrated orange juice".45 FR 12414, Feb. 26, 1980, as amended at 58 FR 2881, Jan. 6, 1993