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Appearance
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Light Pink to Beige to Red-Brown Powder
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Infrared spectrum
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Conforms
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Absorption maxima (0.1N NaOH)
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648 to 654 nm
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Specific absorptivity 1%/1cm (at λmax)
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Min 550.0
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Visual transition interval
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from pH 7.3 (pink-yellow) to pH 8.7 (green-blue)
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Loss on drying (at 110°C; 1 hr)
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Max 5.0%
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