Volatile matter (at 135 °C), not more than 5 percent.
Matter insoluble in both toluene and water (color additive mixed in toluene and the resultant residue isolated and mixed with water to obtain the matter insoluble in both toluene and water), not more than 0.5 percent.
Chlorides and sulfates (calculated as sodium salts), not more than 3 percent.
Aniline, not more than 0.2 percent.
4-Aminoazobenzene, not more than 0.1 percent.
2-Naphthol, not more than 0.2 percent.
1-(Phenylazo)-2-naphthol, not more than 3 percent.
1-[[2-(phenylazo) phenyl]azo]-2-naphthalenol, not more than 2 percent.
Lead (as Pb), not more than 20 parts per million.
Arsenic (as As), not more than 3 parts per million.
Mercury (as Hg), not more than 1 part per million.
Total color, not less than 90 percent.
21 C.F.R. §74.1317