Metallic Wood Process (IMAGE) University of Pennsylvania Caption Stacked plastic spheres, white, provide a framework for nickel, blue, and are ultimately dissolved away. Once there is an open lattice of nickel, other functional coatings, yellow, can be added. Credit University of Pennsylvania Usage Restrictions None License Licensed 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.