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Appearance
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Dark green powder
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Dye content (by spectrophotometry)
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Min 60%
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Transition range (pH 6.8 - 8.0)
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Violet Red - Yellow
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Solubility (0.1% in 50% ethanol)
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Clear solution
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Absorption maxima (50% ethanol + 2 ml acetic acid)
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539 - 544 nm
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Absorptivity (A 1%/1cm; at λmax; in 50% ethanol + 2 ml acetic acid)
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Min 900
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Loss on drying (at 110°C)
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Max 12%
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