Reflective Ultraviolet photography is used in many medical cases and police investigations. A 35mm camera is used with black and white film that, must be sensitive to a light wave length of 300-400 nanometers, and an ultraviolet filter to photography old bruises and injury’s to a patient/ victims exterior. Another use for this form of photography is to see damage to the skin from sun exposure.
Reflective ultraviolet (UV) photography records the reflection and absorption of long-wave UV light by the subject matter excluding exposure of the film by all visible light.i Simply said, long-wave UV light penetrates deeper into the skin than does visible light. Therefore, by placing a specially designed filter over the camera lens, one which will only allow a specific wave-length of UV light (less than 400 nanometers), we can expose the film to only this light. Since UV light penetrates deeper into the skin, the film will pick up the image of a bruise or bite mark, which has been absorbed too deep into the skin to be able to be seen using visible light.