Precipitation may also occur when an antisolvent (a solvent in which the product is insoluble) is added, drastically reducing the solubility of the desired product. Thereafter, the precipitate may easily be separated by filtration , decanting , or centrifugation . An example would be the synthesis of chromic tetraphenylporphyrin chloride: water is added to the DMF reaction solution, and the product precipitates.  Precipitation is also useful in purifying products: crude bmim-Cl is taken up in acetonitrile , and dropped into ethyl acetate, where it precipitates.  Another important application of an antisolvent is in ethanol precipitation of DNA .
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