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- Title
Dual Fingerprint Reagents with Enhanced Sensitivity: 5-Methoxy- and 5-Methylthioninhydrin.
- Authors
Almog, Joseph; Klein, Asne; Davidi, Inbal; Cohen, Yaron; Azoury, Myriam; Levin‐Elad, Michal
- Abstract
“Dual fingerprint reagents” are chemical formulations which produce with latent fingerprints in a single step, impressions that are both colored and fluorescent. Pre-mixed solutions of the two commercially available ninhydrin analogues, 5-methoxyninhydrin (MN) and 5-methylthioninhydrin (MTN) with zinc or cadmium salts, are true dual reagents. They are much more sensitive than the parent dual reagent, ninhydrin/ZnCl2. The main advantage of the new formulations is that they can be used at room temperature, with no need to cool the sample to liquid nitrogen temperature. At 0.05% concentration, which is 10-fold lower than the common ninhydrin working solution, MTN/ZnCl2 is as sensitive as DFO in the fluorescence mode and considerably more sensitive in the color mode. MTN is also slightly cheaper than DFO.
- Subjects
HUMAN fingerprints; FORENSIC sciences; SALT deposits; NONMETALLIC minerals; ZINC; SOIL composition; LIQUID nitrogen; SCIENCE
- Publication
Journal of Forensic Sciences, 2008, Vol 53, Issue 2, p364
- ISSN
0022-1198
- Publication type
Article
- DOI
10.1111/j.1556-4029.2008.00671.x