Open AccessPhysical developer method for detection of latent fingerprints: A review
Author(s) -
Gurvinder S. Sodhi,
Jasjeet Kaur
Publication year - 2016
Publication title -
egyptian journal of forensic sciences/egyptian journal of forensic sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.238
H-Index - 18
eISSN - 2090-5939
pISSN - 2090-536X
DOI - 10.1016/j.ejfs.2015.05.001
Subject(s) - silver nitrate , redox , adsorption , porosity , aqueous solution , metal , salt (chemistry) , materials science , chemistry , nanotechnology , computer science , inorganic chemistry , metallurgy , organic chemistry , composite material
The physical developer technique is a means to detect fingerprints on dry and wet, porous items, including paper articles, clay-based products and adhesive tapes. The process involves an oxidation–reduction couple whereby a solution of an iron salt reduces aqueous silver nitrate to finely divided metallic silver. The technique derives its name from the photographic physical developer which, during processing of film rolls, undergoes a similar redox reaction. The physical developer reveals the fingerprints as dark gray or black images due to the adsorption of metallic silver particles on the fatty acid and lipid components of sweat residue