Sum of water and chlorides and sulfates (calculated as sodium salts), not more than 6 percent.
Matter insoluble in alkaline water, not more than 0.5 percent.
Resorcinol, not more than 0.5 percent.
Phthalic acid, not more than 0.5 percent.
2-2,4-(Dihydroxybenzoyl) benzoic acid, not more than 0.5 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 94 percent.
21 C.F.R. §74.1707