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Appearance
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Black-Brown to Orange-Rust Powder
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pH transition range (pH 5.2 - 6.8)
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Yellow - Purple
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Solubility (0.1 % in water)
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Clear, red-yellow to green-yellow solution
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Absorption maxima (0.1N NaOH)
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587.0 - 591.0 nm
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Absorptivity (A 1%/1cm; at λmax)
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Min 850
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Loss on drying (at 110°C; 1 hr)
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Max 7.0%
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Dye content (by spectrophotometry)
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Min 90.0%
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