Examination of glass occurs when a crime scene contains broken glass and the suspect, or items related to the suspect, contain glass fragments. In some instances a victim of a hit and run will have glass from the striking vehicle's windshield or headlights. Most glass examinations arise due to burglaries. The smallest of glass particles, not readily seen, can be analyzed. Glass varies in color, shape, thickness, refractive index as well as other characteristics. It is these characteristics that a forensic examiner will look at in comparing two samples of glass.
Dispersion Staining of glass using a polarized light microscope.