Specifications

Infrared spectrum Conforms
Arsenic (As) =<3 ppm
Mercury (Hg) =<1 ppm
Ether extractable matter =<0.2 %
Appearance (Color) Red to bordeaux
Insoluble matter =<0.2 % (in water)
Cadmium (Cd) =<1 ppm
Fluorescein =<20 ppm
Appearance (Form) Powder
Dye content >=87 %
Lead (Pb) =<10 ppm
Subsidiary dyes =<4.0 %
Inorganic iodide =<0.1 % (as Sodium iodide)