Section 38397 Of Article 12. Extra Grade Edible Dry Whey, Dry Buttermilk, And Modified Dry Whey From California Food And Agricultural Code >> Division 15. >> Part 3. >> Chapter 5. >> Article 12.

. Buttermilk for drying shall be fresh, sweet and from the churning of sweet cream butter, with or without the addition of harmless lactic culture and unless cultured, shall be held at 45 degrees Fahrenheit or lower until processed. No neutralizing agent or chemical preservative may be added. The product shall be labeled "Extra Grade Dry Buttermilk."