The use of a fluorescent dye to visualize cellular material on surfaces offers a targeted
sampling approach for locating touch DNA on casework items. However, the current
application of such dye is not feasible for examination of relatively large items. As a result,
development of an efficient dye application system is required to translate this approach into
practice. Here, the spray pattern (area covered, intensity, and evenness) of 15 different
commercial spray devices was examined visually using food coloring. From this, five devices …