Gold and silver single-crystal foils of uniform thickness have been produced by electrolysis. The preparationof gold foils involves three steps: the evaporation of silver onto cleaved mica, the electrodeposition ofgold on silver, and, lastly, the stripping of the gold foil by dissolving the intermediate layer of silver. Silverfoils are prepared by (1) evaporating silver onto cleaved mica, (2) electrodepositing silver on silver, and (3)mechanically stripping the silver foil.