Hi, You can change colors for the virus capsid models made with the Multiscale tool. Select one protein surface with the mouse using ctrl-left mouse click on it. Then press the "Copies" button near the top of the Multiscale dialog to extend the selection to all copies of that protein. Then press the color button (the square with the raised ridge) near the middle of the Multiscale dialog and adjust the color of the selected chains. The Actions / Color menu entries do not work for changing the Multiscale surface colors. Unfortunately, none of the Actions menu entries act on surfaces created with the Multiscale tool. All the controls for manipulating multiscale models are in that one Multiscale dialog. It's a confusing user interface resulting from the fact that the Multiscale tool is built on top of the core Chimera capabilities and has no way of changing the behaviour of core user interfaces like the Actions menu. Tom