FAC § 61933

Class 2 comprises any market milk, market skim milk, or market cream used in the manufacture of market cream, homogenized market cream, sour cream, sour cream dressing, sour half-and-half or light sour cream, uncreamed, creamed, or partially creamed cottage cheese, soft fresh cheese (fromage frais), buttermilk, kefir, and yogurt. Class 2 also comprises any market milk, market skim milk, or market cream used in the manufacture of any product for which a definition and standard is prescribed in Division 15 (commencing with Section 32501), except any product that is included in class 1, class 3, class 4a, or class 4b.