The present invention relates to a method for combining extra particulate additive with toner. The method includes mixing toner and extra particulate additive in a conical mixer having temperature control. The toner may contain polymeric material having a glass transition temperature (Tg) and the mixing may be carried out wherein the temperature of the mixture is maintained at a temperature less than Tg. The above method may also be applied to a toner formulation that has first undergone a rounding operation.