Volatile matter (at 135 °C.), not more than 2.0 percent.
Matter insoluble in both carbon tetrachloride and water, not more than 0.5 percent.
p- Toluidine, not more than 0.2 percent.
1-Hydroxy-9,10-anthracenedione, not more than 0.5 percent.
1,4-Dihydroxy-9,10-anthracenedione, not more than 0.5 percent.
Subsidiary colors, not more than 1.0 percent.
Lead (as Pb), not more than 20 parts per million.
Arsenic (as As), not more than 3 parts per million.
Total color, not less than 96.0 percent.
21 C.F.R. §74.1602