…om the uses established in this section do not exist or have been waived. 44 FR 20656 , Apr. 6, 1979, as amended at 49 FR 5611 , Feb. 14, 1984] § 184.1077 Potassium acid tartrate. Potassium acid tartrate (C KO , CAS Reg. No. 868-14-4) is the potassium acid salt of l−(+)−tartaric …