it was kept in ethanol for almost a month and the crystals turned black
Dr. Ojo,
You can use pass H2 gas under certain temperatures to reduce the surface of the crystal. You need to find the best working temperature with your tests.
Good luck
Maohong Fan
Oja
Recrystallize it ! but this time filter and save under N2.
Do recrystallization process or pass them with anti -oxidant gases to retain them.
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