Multivalent ion electrochromism (IMAGE) Beijing Institute of Technology Press Co., Ltd Caption Scientists from Guangxi University revealed the effect of cation types on electrochromic properties of titanium dioxide nanocrystals. Credit Yi Liang, Guangxi University Usage Restrictions News organizations may use or redistribute this image, with proper attribution, as part of news coverage of this paper only. 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.