Auger studies of silver, copper, gold, and nickel nuclei evaporated onto carbon films show that a large fraction of the metal diffuses into the film. Subsequent exposure of the metal nuclei on the surface to room atmosphere for one week results in severe contamination by S. Relative changes in the Auger peak positions for Au evaporated on carbon have been recorded as a function of coverage. The studies indicate that the changes are complete at 2.5×1015atoms/cm2. Carbide formation has been observed in the case of evaporated Fe and Al on carbon, but not for any of the other metals considered here.