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Normal
Crystals formed from EA should be rather red and not light-tan to even white. So would not assume that this is Bufo.The higher the concentration upon Crystallize-Begin, the more "junk" will be also stashed inside the crystal grid. And solubility in EA is very high even at -20 °C, so it only precipitates from a very reduced solution.I have seen EA + Heptane in literature, but this will also leave behind quite some Goodies at -20 °C (if you care about yield).
Crystals formed from EA should be rather red and not light-tan to even white. So would not assume that this is Bufo.
The higher the concentration upon Crystallize-Begin, the more "junk" will be also stashed inside the crystal grid. And solubility in EA is very high even at -20 °C, so it only precipitates from a very reduced solution.
I have seen EA + Heptane in literature, but this will also leave behind quite some Goodies at -20 °C (if you care about yield).
