 In this method C60 was separated from a mixture of C60, C70 and higher fullerene compounds by first adding the amidine compound DBU to a solution of the mixture in 1,2,3-trimethylbenzene.DBU as it turns out only reacts to C70 fullerenes and higher which reaction products separate out and can be removed by filtration.C60 fullerenes do not have any affinity for DBU and are subsequently isolated.