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Appearance
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Orange colored powder
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pH 5.5- 6.8
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Yellow to reddish-violet
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Absorption maxima in NaOH 0.01 mol/L (λmax1)
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564 - 568 nm
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Absorption maxima in NaOH 0.01 mol/L (λmax2)
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605 - 609 nm
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Absorptivity (A 1%/1cm; at λmax2)
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Min 525
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Sulphated ash
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Max 1%
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Loss on drying
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Max 5%
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Absorptivity (A 1%/1cm; at λmax1)
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Min 625
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