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One is usually enough, often the primary freeze-precipitated stuff is already good enough.To prevent formation of the n-oxide, it might be more practical to cover the container in a blanket of CO2 than sucking oxygen out. CO2 is easy to generate from soda, bicarbonate or limestone and an acid.Nice crystals shown here, really inspiring!
One is usually enough, often the primary freeze-precipitated stuff is already good enough.
To prevent formation of the n-oxide, it might be more practical to cover the container in a blanket of CO2 than sucking oxygen out. CO2 is easy to generate from soda, bicarbonate or limestone and an acid.
Nice crystals shown here, really inspiring!