83) Recrystallization helps purify products and remove contaminants (French et al. 83). To do this, the product is dissolved in a hot substance and then reforms in the form of crystals when the substance cools; the crystals are filtered out of the solution so that they are separated from any impurities dissolved in the substance (French et al. 83). The appropriate solvent used for recrystallization should not react with the desired product (French et al. 84). Instead, it should dissolve the desired product at warm temperatures, but not dissolve it at cold temperatures (French et al..