Section 58.346 - Whipped butter(a) The quality requirements for whipped butter shall be in accordance with the U.S. Standards for Grades of Whipped Butter for U.S. Grade AA and U.S. Grade A, respectively.(b) Whipped butter shall also be subject to the following specifications when sampled and tested in accordance with § 58.336 and § 58.337 , respectively:(1) Proteolytic count, not more than 50 per gram; yeast and mold count, not more than 10 per gram; coliform count, not more than 10 per gram; and keeping-quality test, satisfactory after 7 days at 72 °F.(2) Optional except when required or requested: Copper content, not more than 0.3 ppm; iron content, not more than 1.0 ppm; enterococci, not more than 10 per gram.59 FR 1264, Jan. 10, 1994, as amended at 67 FR 48976, July 29, 2002