Figure (IMAGE) National Institute for Materials Science, Japan Caption Printing of a periodic microstructure on a glass surface using a PDMS slab. Iridescent colors generated by the microstructure are also shown in the second row images. Credit Kota Shiba National Institute for Materials Science 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.