Latent fingerprints are not often left in
heterogeneous or protected environments, so there is
the need to be able to detect their presence on
different surfaces and after they have undergone the
action of atmospheric agents or have been found, for
example, on objects soaking in water of different
types of impurities and sediments.
Small particle reagent (SPR) is a physical
development technique for fingerprint detection on
wet or moist surfaces.(1) There are many formulae of
SPR available nowadays but the optimal formula has
never been reported. In this study, the best SPRformula
for detecting latent fingerprints on wet nonporous
surfaces was demonstrated.