Appearance (Colour)
Dark red to red-brown to brown black to orange-brown
Appearance (Form)
Powder
Solubility (Colour) 0.1% solution in ethanol
Clear
Loss on drying at 105°C
max.7.0%
Suitability as pH indicator
pH 8.2 (Orange-brown) - pH 10.0 (Blue-green)
Absorbance (A) of 1% in 0.1N HClO4 in a 1 cm cell v/s 0.1N HClO4
@622-626nm
min.640
