A method for reducing foam associated with an ink reservoir of a printing press is provided. The method can include printing a plurality of printed images with a nonaqueous ink delivered from an ink reservoir, periodically delivering a defoaming agent into the ink reservoir to reduce foam formation in the ink reservoir, and periodically delivering a charge control agent into the ink reservoir to charge the nonaqueous ink. Accordingly, fresh defoaming agent can be added to the ink reservoir periodically to reduce the level of foam in the reservoir and thus avoiding increasing foam levels associated with the degradation of the defoaming agent over time.