C₁₆H₈N₂Na₂O₈S₂
Acid Blue 74 , Indigotine
M.W: 466,36   CAS: 860-22-0  EC: 212-728-8  TARIC: 32041200

H: H317  P: P261;P272;P280;P302+P352;P333+P313;P501  

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• Appearance ? Dark blue-violet powder having a metallic luster of copper
• Absorption maximum in water (H₂O) 608 – 612nm
• Absorptivity (A₁%; 1cm; ?_max; 0.001% H₂O) 380 – 475nm
• Loss on drying (110 °C) ? 10%
• Suitability for microbiology

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C₂₇H₂₈Br₂O₅S
BTB
M.W: 624.4  CAS: 76-59-5  EC: 200-971-2  TARIC: 29349990

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• Appearance Pink to purple coloured powder
• Appearance of solution Passes test
• pH Transition (6.0 – 7.6) Yellow to Blue
• Transition range (ACS) Passes test
• Sensitivity Passes test
• Loss on drying (110 °C) ? 3%

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C₂₁H₁₆Br₂O₅S
BCP
M.W: 540.22  CAS: 115-40-2  EC: 204-087-8  TARIC: 29349990

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• Transition range pH 5.2 – 6.8
• yellow to purple
• Appearance of solution conforms
• Sensitivity Passes test
• Loss on drying (110 °C) ? 1%
• Absorption maximum ?_2max (pH 5.2) 427 – 431nm
• Absorption maximum ?_2max (pH 6.8) 588 – 590nm
• Absorptivity pH5.2 on dried substance 400 – 450nm
• Absorptivity pH6.8 on dried substance 1000 – 1100nm

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