POWDER HAVING AT LEAST ONE LAYER AND PROCESS FOR PREPARING THE SAME

摘要

A powder comprising a metal or metallic compound core having thereon at least one metal or metallic oxide layer having a uniform thickness of from 0.01 .mu.m to 20 .mu.m, wherein the metal of the metal or metallic oxide layer is different from the metal constituting the metal or metallic compound core and a process for preparing the same.