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... Earlier, in order to reveal latent fingerprints, methods like dusting with amorphous carbon, fuming with iodine vapor or silver nitrate were used. Later, chemicals like ninhydrin, which had the ability to develop latent fingerprints on paper, were discovered. The necessity to chemically reveal and further enhance latent fingerprints on a variety of porous and non-porous surfaces led to the development of ninhydrin analogues, glues containing cyanoacrylate ester, luminescent dusting powders etc (Frégeau, Germain and Fourney, 1999).
Mechanism of Action of Chemical Treatments
Ninhydrin and 1,8-diaza-9-fluorenone (DFO) react with amino acids to give a product, although heat is required for the r...