We are the manufacturers of Methylene Blue Zinc free which passes inIP/BP/EP/USP norms. The specifications are as under :

Specifications:
1.Product :METHYLENE BLUE
2.C.I No. :52015
3.Appearance : Dark Green Crystalline Powder
4.Assay (as is basis) :80 % - 85%
5.Assay (on dry basis) :98% -101%
6.Loss on drying :10% -20%
7.Solubility :Clear Blue Solution
8.Ash content :1.2% Max
9.Residual Solvent :Nil
10.Aluminium :< 100 ppm Max
11.Cadmium :< 1ppm Max
12.Chromium :< 10ppm Max
13.Copper :< 50ppm Max
14.Tin :< 10 ppm Max
15.Iron :< 100ppm Max
16.Mangenese :< 10ppm Max
17.Mercury :Nil
18.Molybdenum :