The petroleum ether based formulation that we supply nowadays has a lower concentration of DFO than the one based on frigen (0.3 gram versus 0.5 gram per liter). Due to the ban on the use of frigen, this formulation can no longer be used. The formulation prescribed dissolving 0.5 gram DFO in 40 ml methanol and 20 ml acetic acid, to be diluted with frigen to 1 liter of working solution. The formulation used and published by Pounds was based on frigen (1,1,2-trichlorotrifluoroethane). Such spectacular results were never mentioned by later researchers so probably this number was not reproducable. When DFO was introduced it was reported by the Home Office that according to their research up to 2.5 times the amounts of identifiable prints were developed with DFO, compared to ninhydrin. A prerequisite for the advantageous use of DFO however, is the availability of a (preferably strong) light source that can deliver light in the blue-green region (for example a Polilight). However, when the fluorescence of the DFO treated prints is viewed, DFO develops fingerprints better. The consensus in the forensic community is that where DFO was used, 1,2-IND is the better alternative.įingerprints, developed with DFO are less visible (light red/purple) than if they would have been treated with ninhydrin.
The introduction of the reagent was announced at the IAI conference in Pensacola (USA, July 1989 ) by C.A. Pounds of the Central Research and Support Establishment of the Home Office Forensic Service in Aldermanston. It is assumed that it reacts with the same components in the fingerprint as ninhydrin does. Self-adhesive labels with numbers or arrowsĭFO is a chemical compound that, like ninhydrin, 5-MTN, and 1,2-IND is used for the development of fingerprints on porous surfaces (for example paper).Fluorescent L-scale rulers, ABFO #2 style.WorkforceHub helps businesses manage remote employees and meet performance expectations with integrated cost control tools that comply with federal, state, and local laws. WorkforceHub integrates with all popular payroll processing systems and other SwipeClock HRMS software.
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