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Appearance
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Green to red-brown to brown powder
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pH 4.8 - 6.4
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Yellow to purple
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Absorption maxima (λmax2) c= 0.01 g/L ; 0.1 NaOH
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572 - 575 nm
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Solubility (0.1% in ethanol)
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Clear brown yellow to dark orange solution
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Absorptivity (A 1%/1cm; at λmax)
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Min. 1000
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Loss on drying
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Max. 8.0%
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