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Appearance (Color)
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Dark red or brown to black
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Appearance (Form)
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Crystalline powder or powder
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Loss on drying
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<8.0% (105°C/contant wt.)
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Absorption maxima
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512.0-518.0nm (0.1% v/w in Distilled Water)
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Specific Absorbance (E 1%/1cm)
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>400 (lambda-max in Distilled Water)
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UV spectrophotometry
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>400 (lambda-max in Distilled Water)
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Solution test
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(0.1% w/v in Distilled Water) : Clear red solution
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