A colored ceramic body for use in various parts of electronic equipment, comprising at least one of A12O3 and BeO as a basic component, 0.1 to 5 percent by weight CoO and further additive chosen from the group consisting of MnO2, Cr2O3, V2O5, Fe2O3 and mixtures thereof, the total amount of CoO and further additive being 1.0 to 10 percent by weight. The ceramic body is dark in color and has excellent electrical, mechanical and thermal characteristics, and maintains an acceptably high volume resistivity even after the body has been heated in a reducing atmosphere.