Sum of volatile matter (at 135 °C) and halides and sulfates (calculated as soduim salts), not more than 10 percent.
Water-insoluble matter not more than 0.5 percent.
Disodium salt of phthalic acid, not more than 1 percent.
Sodium salt of 2-(3,5-Dibromo-2,4-dihydroxybenzoyl)benzoic acid, not more than 0.5 percent.
2',4',5',7'-Tetrabromofluorescein, ethyl ester, not more than 1 percent.
Brominated resorcinol, not more than 0.4 percent.
Sum of disodium salts of mono- and dibromofluoresceins, not more than 2 percent.
Sum of disodium salts of tribromofluoresceins, not more than 25 percent.
Disodium salt of 2',4',5',7'-Tetrabromofluorescein, not less than 72 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. §74.1322