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Appearance
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Dark green to brown to black powder
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Solubility (0.1% in water)
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Clear solution
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Absorption maxima in water
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435 - 443 nm
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Absorptivity (A 1%/1cm; at λmax; in water)
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Min 120
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Loss on drying (at 110°C)
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Max 10%
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Suitability (as metal indicator)
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Passes test
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