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Appearance
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Greenish black/blue crystalline powder
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Absorption maxima in methanol (λmax1)
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640 - 648 nm
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Absorption maxima in methanol (λmax2)
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522 - 525 nm
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Specific absorptivity 1%/1cm (at λmax1)
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Min 1100
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Specific absorptivity 1%/1cm (at lmax2)
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Min 650
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Suitability (for microscopy)
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Passes test
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Loss on drying (at 110°C)
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Max 10%
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