Fingerprints are one of the important pieces evidence for establishing the
identification of a suspect. Latent prints are the fingerprint which can be found at a
crime scene or on objects related to criminal matters but they are less visible or
invisible. Thus application techniques are necessary for developing latent prints but
all techniques are based on the surface texture which bears latent prints. One of the
major problems is trying to visualize the latent prints on wet surface. One of the
most effective application techniques for developing latent prints on wet nonporous
surfaces is Small Particle Reagent (SPR).