As an investigative tool, luminol can be applied to analyze crime scenes where there is reason to believe that blood has been shed and an attempt has been made to conceal blood by washing away the evidence. A new technique, developed to enhance documentation of the luminol reaction, is achieved through fill flash photography. This technique makes it possible to obtain quality photographs of the luminol reaction in the context of a fully detailed picture of the articles in question. When using the technique, it is necessary to combine both time exposure and fill flash photography. The time exposure is essential so that a sufficient amount of light, generated from the luminol reaction, is accumulated in intensity on film. The fill flash will be intense enough to record everything in the field of view as it would appear under normal lighting conditions. The technique will yield negatives that can separate subtle differences in contrasting articles. Parameters of routine flash photography are the only limits governing the fill flash photo luminescence technique. Materials and methods associated with using the technique are detailed. 5 figures, 5 references.