New negative staining reagents (IMAGE) Hiroshima University Caption Preyssler-type phosphotungstate, [P5W30O110M(H2O)]n-, Green octahedra and blue tetrahedra represent W-O6 octahedra and P-O4 tetrahedra, respectively, and grey and black balls represent an encapsulated cation, M, and water oxygen, respectively. Credit Masahiro Sadakane, Graduate School of Advanced Science and Engineering, Hiroshima 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.