UBMOF-2 (IMAGE) University at Buffalo Caption UBMOF-2, a crystalline material, goes from clear to blue when it's exposed to ultraviolent light, is shown. Heating the material up brings it back to its original hue. As the material shifts between colors, its structure is also changing -- a property that could enable it to act as a sponge that traps materials inside shape-shifting pores. Credit Credit: Ian Walton Usage Restrictions This image may only be used in conjunction with news stories discussing the research in the associated press release. 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.