Teflon, Wear Metals, and Emery
              
              
                Transmitted Circular Polarized Light with Reflected Darkfield Illumination
                The large, bright, birefringent particle in this view is abraded Teflon. There are some
                adhering wear metals and 
                a large emery particle stuck in one side (lower right). This emery particle may have
                been responsible for carving
                the Teflon ribbon from the Teflon gasket used in this system.