SMILES sample materials (IMAGE) Indiana University Caption 3D printed SMILES materials containing fluorescent dyes emit a luminescent glow under ultraviolet light. Credit James Brosher, Indiana University Usage Restrictions Provide photo credit 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.