Electrotyping is activated by electric currents that flow between anode wires that are also immersed in the solution and the wire connected to the coated mold (the cathode). For copper electrotyping, a typical aqueous electrolyte contains copper sulfate (CuSO4) and sulfuric acid (H2SO4), and the anode is also copper; the arrangement is illustrated in the figure. The electric current causes copper atoms to dissolve from the anode's surface and to enter the electrolyte as copper ions (Cu++ in the figure). Copper ions are taken up by the mold's conducting surface at the same rate at which copper dissolves from the anode, thus completing the electrical circuit. When the copper layer on the mold grows to the desired thickness, the electric current is stopped. The mold and its attached electrotype are removed from the solution, and the electrotype and the mold are separated. An animation of the electrotyping process was produced in 2011 by the Metropolitan Museum of Art. Other metals besides copper can be electrotyped; similar procedures apply, but each different metal needs its own anode and electrolyte chemicals.