Method of coating electrostatographic carrier particles

A method of coating electrostatographic carrier particles comprising introducing an upwardly flowing low pressure gas and a centrally located upwardly flowing high pressure gas at about one-third their full flow rate into a combined fluidized bed and spouted bed coating apparatus, loading said carrier particles into said coating apparatus, increasing the flow rate of said low pressure gas to its full flow rate of about 305 cubic feet per minute at S.T.P. with heating to about 40.degree.C to bring said carrier particles to said temperature, increasing the flow rate of said high pressure gas to its full flow rate of about 16 cubic feet per minute at S.T.P. at about 1.5 atmospheres to form a fluidized bed of said carrier particles, introducing a solution or dispersion of coating material in a carrier liquid into said fluidized bed whereby said carrier particles are contacted with a cloud of atomized liquid droplets of said coating material in a disperse state resulting in a homogeneous distribution of said liquid droplets among said carrier particles, and maintaining said fluidized bed of carrier particles at a temperature and for a time sufficient to volatilize and evaporate said carrier liquid.