Supramolecular Ink Eiffel Towers (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption Eiffel Tower-shaped luminescent structures 3D-printed from supramolecular ink. Each 2-centimeter-tall device is fabricated from supramolecular ink that emits blue or green light when exposed to 254-nanometer ultraviolet light. Credit Peidong Yang and Cheng Zhu/Berkeley Lab. Courtesy of Science. Usage Restrictions Credit Peidong Yang and Cheng Zhu/Berkeley Lab. Courtesy of Science. 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.