Cu-Ni complex inks (IMAGE) National Institute for Materials Science, Japan Caption Figure. (a) Inks composed of copper and nickel complexes. (b, c) Copper–nickel alloys printed on a polyimide film (b) and a transparent film (c). (d) SEM mapping image of a copper core–nickel shell nanostructure. Credit Takeo Minari National Institute for Materials Science MINARI.Takeo@nims.go.jp Usage Restrictions None License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.