Curiosity about a mistake that left tiny dots on a germanium wafer with evaporated metal films led to the discovery of beautiful spiral patterns etched on the surface of the semiconductor by a ...

a cupric chloride solution by treating scrap copper with hydrochloric acid, it’s easier to just throw all the ingredients together with the PCB to be etched and let the copper on the board stand ...

Beautiful spiral patterns had been etched into the germanium surface by a chemical reaction. Wong's curiosity led her on a journey to discover what no one had seen before: Hundreds of near ...