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Appearance
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Dark green to very dark green or blakish green powder
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Dye content (by spectrophotometry)
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Min 80%
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Absorption maxima in water
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628 - 633 nm
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Solubility (0.1% in water)
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Clear solution
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Absorptivity ( 1%/1cm; at λmax; 0.005 g/L in water)
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Min 1200
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Loss on drying (at 110°C)
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Max 8%
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