Very slightly soluble in water, freely soluble in alcohol and in methanol.
A) Melting Point: 1250 C to 1280 C.
B) Infrared absorption spectrophotometry
C) Thin layer chromatography
D) Solution B is yellow to orange-brown. Solution A is orange to red, the color being clearly more intense than any similar color, which may be obtained with soln. B.
Appearance of solution
Solution S is clear and not more intensely colored than ref. solution BY6
NMT 0.1 ml of 0.1 M NaOH is required to change the color of the indicator to blue.
TLC—Any spot in the chromatogram obtained with test solution (a), apart from the principal spot, is not more intense than the spot in the chromatogram obtained with reference solution (a) (0.5 per cent).