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Appearance
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Dark red to brown to black powder
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Absorption maxima λmax1 (0.03 g/L in water)
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513 - 519 nm
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Extinction coefficient at λmax1
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Min 14500
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Absorption maxima λmax2 (0.03 g/L in water)
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320 - 326 nm
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Extinction coefficient at λmax2
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Min 9000
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Absorption maxima λmax3 (0.03 g/L in water)
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214 - 220 nm
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Extinction coefficient at λmax3
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Min 33000
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