PARAMETER LIMIT

• Description Dark green crystalline powder.
• Dye Content (Titanometry; on dried substance) > 88.0%
• Absorption Maximum (in 50% ethanol) 549 – 552 nm
• Absorption Ratio (A max – 15 nm) / (A max + 15 nm) 1.16 – 1.35
• Absorptivity (A1% / 1 cm atmax in 50% ethanol; on dried basis)
• 2000 – 2710
• Suitability for microscopy To pass the test.
• TLC examination To pass the test.

MAXIMUM LIMIT OF IMPURITY
– Loss on drying (at 110°C) 10.0%