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Appearance
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White to off-white powder.
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Solubility (0.1% in 95% ethanol)
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Clear solution
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Absorption maxima (0.1N NaOH)
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600 - 605nm
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Absorptivity (A1%/1cm 0.1N NaOH, at λmax, on dried substance)
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350 - 450
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Loss on drying (at 110°C)
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Max 7.0%
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Suitability (as indicator)
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Passes test
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