|
Appearance
|
White to light yellow to light purple powder or crystals
|
|
Assay (acidimetric)
|
Min 99.5%
|
|
Substance insoluble in water
|
Passes test
|
|
Water (H2O)
|
7 - 8.5%
|
|
Sulphated ash
|
Max 0.2%
|
|
Suitability (as indicator)
|
Passes test
|
|
Sensitivity test for iron (II)
|
Passes test
|