The alkalinity of ash which is contained in extra grade edible dry whey shall not exceed 225 ml. 0.1 normal hydrochloric acid (0.1 N HCl) per 100 grams. The scorched particle content shall be not more than 15.0 mg. and the solubility index shall be not more than 1.25 ml.
Ca. Food and Agric. Code § 38394