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Appearance
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Yellow to orange to brown powder
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Dye content
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Min 70.0%
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Transition range
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pH 4.3-6.3
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Yellow-Pink
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pH 9.4-12.0
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Brown orange-Violet
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Solubility (0.1% in water)
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Clear solution
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Absorption maxima (0.1 mol/L in NaOH) λmax1
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553-559 nm
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Absorption maxima (0.1 mol/L in NaOH) λmax2
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592-599 nm
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Absorptivity (A1%/1cm at 556 nm )
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Min 350.0
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Absorptivity (A1%/1cm at 595 nm )
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Min 325.0
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Loss on drying (at 110°C)
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Max 5.0%
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