Recrystallisation protocol:

Note: The warmer the storage temperature the quicker nitrostyrene's polymerize. Viable crystals can be stored in a refrigerator (0 to 5 °C / 30 to 40 °F) for 6 months, or a freezer (-5 to -15 °C / 20 to 5 °F) for 2 years or more.

If you do not have a buchner funnel and vacuum source, then you will have to gravity filter, using beaker that a funnel can sit on, place 2 coffee filters and pour crystal and IPA mixture in, now place everything in a refrigerator to filter and then dry before storing.

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