“The author has used a five year old fluorescin preparation.It is not uncommon to use a 1-2 month preparation. Luminol rarely last more than 1 hour. All preparations, including fresh preparations, should be tested on a known exemplar prior to scene application. The long lasting fluorescence from fluorescein and the alternate light source intensity combine to allow immediate digital imagining of fluorescein reactions. Thus, additional materials not required to maintain a reaction as it is in the case of luminol. This allow a higher probability of detail with fluorescein reactions. The author has captured numerous shoe wear impressions that provided class characteristic comparison. It works on Cold Cases”Click here to download a copy of this study
