colloidal suspension (IMAGE) Johannes Gutenberg Universitaet Mainz Caption A colloidal suspension directly after being added to a suspension medium and 5 seconds later, after crystallization has occurred. A spherical polycrystalline ball forms that exhibits a vivid play of color on its surface but otherwise remains opaque. Credit photo/©: Josefine von Puttkamer-Luerssen / JGU Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. No derivatives or adaptations of the work are permitted. License CC BY-NC-ND 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.