Non-magnetizable effect pigments

A colored effect pigment, comprising

• a substrate comprising aluminum or an aluminum alloy which is optionally coated with one or more passivation layers, and
• an aluminum-doped iron oxide layer,
• wherein no separate Al2O3, Al(OH)3 and/or AlO(OH) phase is present in the aluminum-doped iron oxide layer, and
• wherein the optional one or more passivation layers are made of at least one selected from the group consisting of a metal phosphate, a Ti oxide, a V oxide, a Cr oxide, a Mn oxide, a Co oxide, a Ni oxide, a Cu oxide, a Zn oxide, an Al oxide, a Zr oxide, a Nb oxide, a Mo oxide, a Ta oxide, a W oxide, a Ge oxide, a Si oxide, a Sn oxide, and a Bi oxide.