Triangular Shape (IMAGE) University at Buffalo Caption The new water purification technique involves draping a sheet of carbon-dipped paper in an upside-down "V." The paper's bottom edges soak up water, while the carbon coating absorbs solar energy and transforms it into heat for evaporation. Credit Credit: Huaxiu Chen Usage Restrictions This image may only be used with news reports 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.