Volatile matter (at 135 °C.), not more than 3 percent.
Matter extractable by alcoholic HCl (0.1 ml of concentrated hydrochloric acid per 50 ml of 95 percent ethyl alcohol), not more than 1 percent.
2-Amino anthraquinone, not more than 0.2 percent.
Organically combined chlorine in pure dye, 13.0-14.8 percent.
Lead (as Pb), not more than 20 p/m.
Arsenic (as As), not more than 3 p/m.
Total color, not less than 97 percent.
21 C.F.R. §74.1109