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Appearance
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Red-brown to dark brown crystalline powder
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Solubility (0.1% in 0.1 N NaOH)
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Clear reddish to violet
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Absorption maxima (0.1N NaOH)
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575 - 585 nm
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Absorptivity (A 1%/1cm; at λmax)
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Min 550
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Loss on drying (at 105°C; 1 hr)
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Max 7%
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Sensitivity for Zinc
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Passes test
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