You wish to recrystallize a compound that displays a melting…

You wish to recrystallize a compound that displays a melting pointing range of 83˚C to 85˚C and has black flecks present in an otherwise colorless (white) powder. What would be the step that would remove the black flecks that also happen to be insoluble in the recrystallization solvent at any temperature (i.e. room temperature to the boiling point of the solvent)?