a process and apparatus for developing a latent electrostatic image on an electrophotographic copying material by means of a toner dispersion . an infeed roller applies the toner dispersion to the copying material , and , downstream thereof , a distribution roller acts on the surface of the copying material . to solve the problem of reproducing fine white indicia , such as thin white lines , on a black background , a voltage , having the same polarity as the surface charge of the latent electrostatic image on the copying material , is applied to the distribution roller . squeegee rollers downstream of the distribution roller effect removal of unused toner . toner , which adheres to the distribution roller during application of voltage to the distribution roller , is sprayed off and recovered for recycling , the spraying agent being toner dispersion .