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Appearance
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Dark red crystalline powder
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Assay (by HClO4 titration; on dried basis)
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Min 98%
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Absorption maxima in methanol
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524 - 527 nm
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Absorptivity (A 1%/1cm; λmax; in 50% methanol; on dried substances)
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155 - 165
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Loss on drying (at 130°C; 4 hrs)
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Max 7%
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Solubility (10 mg/mL in water)
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Clear red to dark red solution
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