Wash the filter with a small amount of additional hot solvent if necessary. Cool the solution slowly and without disturbing to allow pure crystals to grow. Cool completely in an ice and water bath. A seed crystal may be added if crystallization does not initiate on its own. Scratching the inside wall of the container with a glass rod also helps induce crystallization.
Suction filter the crystals.
Wash the crystals with a small amount of ice cold solvent to remove traces of impurities left from the solution. Dry the crystals to remove solvent. Air drying is usually best. Vacuum drying speeds this process. Oven drying can be used only if the compound is stable to high temperatures and does not melt at the temperature of drying.