|
Appearance
|
Black powder
|
|
Substance soluble in ethanol
|
Max 0.2%
|
|
Substance soluble in HCl
|
Max 1.0%
|
|
Chloride (Cl)
|
Max 0.2%
|
|
Sulphate (SO4)
|
Max 0.2%
|
|
Heavy metal (as Pb)
|
Max 0.005%
|
|
Iron (Fe)
|
Max 0.015%
|
|
Loss on drying (at 120°C)
|
Max 8.0%
|
|
pH Value
|
6.5 to 7.5
|
|
Methylene blue value
|
Min 240
|