AURUNA® 502 is a neutral, cadmium-free gold copper electrolyte working without free cyanide. The red surfaces are bright, very hard and abrasion-resistant. As gold-saving, low-carat layers, the surface exhibits very good corrosion and tarnish resistance. The gold copper electrolyte can be used for rack and barrel plating, it can deposit layers of up to max. 10 μm in thickness.