Colloidal Crystals (2 of 2) (IMAGE) Georgia Institute of Technology Caption Microscope image shows the higher optical density of a microgel particle that had shrunk to match the size of other particles in the assembly. Credit Credit: <I>Angewandte Chemie International</I> Usage Restrictions None 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.