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Appearance
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Yellow to orange to brown powder
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Absorption maxima (λmax1)
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592 - 599 nm (in 0.1 N NaOH)
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Absorption maxima (λmax2)
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554 to 558 nm (in 0.1 N NaOH)
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Visual transition range
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pH 3.5 (yellow) to pH 6.5 (pink), pH 9.4 (orange-brown) to pH 12.0 (violet)
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