A coated iron powder including a core of precursor iron powder, wherein the iron powder is reduced or electrolytic iron powder； a first coating including a first polymer and a first pigment, wherein the coating has a thickness of 5 to 30 µm； a coating of an adjuvant, wherein the adjuvant includes ascorbic acid； and a second coating including a second polymer and a second pigment, wherein the coating has a thickness of 5 to 30 µm.
