Detection of latent fingerprints on wide surfaces and being able to
develop them without damaging other evidences like body fluids, small fragments,
hair or handwritings on questioned documents are two serious problems for the the
crime scene examiner. Conventional dusting technique, though it is very flexible,
may cause contamination in most cases. In addition, the result of the misapplication
of dusts-including SPR, superglue fuming or ninhydrin aerosols may be a lost or irrevocably
destroyed print.