• C.A.S. No.
• 603–45–2
• C.I. NO.
• 43800
• M.F.
• C₁₉H₁₄O₃
• M.W.
• 290.32 gm/mole

Specifications:

• Dye content
• >85%
• Solubility 0.1% (Ethanol)
• Clear solution
• Absorption maximum (Ethanol+5ml 1N HCl) λmax.
• 482–487 nm
• Absorptivity (A1%/1cm, in Ethanol+5ml 1N HCl at λmax)
• >2000
• Loss on drying
• <3%