Small particle reagents technique can help to point out wet latent fingerprints.

SPR is a technique performed to detect latent fingerprints left on wet surfaces, based upon the reaction between the fatty components present in the traces and hydrophobic tails of the specific reagents. These tails are linked to a hydrophilic head, which reacts with metal salt to give a white or black precipitate. The literature reports that it is possible identifying latent fingerprints with cyanoacrylate fuming procedure, after drying the surface, but you cannot always do it. In the present report we want to show a casework that can concern a find completely dust covered.