Rejuvenating electrostatographic carrier particles

A method for rejuvenating electrostatographic carrier particles which have been employed in electrostatographic developer compositions of the kind comprising finely-divided electrostatographic toner particles electrostatically clinging to the carrier particles, said carrier particles comprising a metal core having combustible resinous material on the surface thereof, the method comprising fluidizing said carrier particles by passing a combustible gas and air mixture upwardly through a bed of said carrier particles, and heating said carrier particles in a fluidized condition to a temperature of from between about 420.degree. C. and about 525.degree. C. by burning said combustible gas and air mixture above said bed until said combustible resinous material on the surface of said core is removed, said core metal being selected from the group consisting of iron and steel, and said heating of said carrier particles being performed in the presence of a stoichiometric excess of oxygen with respect to the proportion of oxygen required for complete combustion of said combustible gas.