The technique of episcopic coaxial illumination has been used effectively as a non destructive method of visualizing latent fingerprints on smooth non-porous surfaces such as glass, polished metal and plastics, such as plastic bags. The technique is simple and effective. The accessory provides for the connection of the liquid light guide of a Polilight which acts as the light source. Light emitted by the Polilight is reflected from a semi-transparent mirror. Both the incident light and reflected light are in a plane perpendicular to the surface. The deposits from the ridges of the fingerprint diffuse the incident light whereas the surface reflects spectularly resulting in dark ridges against a light background.The Polilight ECIA can be used at the scene of crime as well as in the laboratory. The unit can be hand-held for searching, or tripod mounted for camera work. The light guide is inserted into the light holder of the ECIA and the securing screw turned to clamp the light guide which as been pushed in as far as it will travel. There is an adjustable focusing knob as well as the capability of adjusting the mirror tilt as well.