This study was conducted to determine the optimum light and filter combinations of laser and light-emitting diode (LED) light for use with indanedione and two new chemical reagents, genipin and lawsone, in detecting and identifying latent fingermarks.
The findings show that treatment with indanedione zinc chloride was most effective in the excitation of fingermarks. With the exception of the 577nm laser and genipin, the two new reagents, genipin and lawsone, did not provide useful results under test conditions. Although the LED light source revealed a significant number of untreated impressions, the laser light source proved to be more sensitive at detecting untreated impressions, and the ridge clarity was often higher on the samples examined. Monochromatic sources (lasers) and broad-band sources such as LEDs each exhibited the potential to detect evidence missed by the other. The light sources used were Coherent TracER lasers operating at 460nm, 532nm, and 577nm; and the Rofin Polilight Flare Plus LED operating at 505nm. Deliberate and randomly created fingermarks were first examined using the light sources alone and then again following treatment with one of the reagents. Figures, table, and references
Downloads
Similar Publications
- A data set of bloodstain patterns for teaching and research in bloodstain pattern analysis: Impact beating spatters
- Dual Pathways of Concealed Gun Carrying and Use from Adolescence to Adulthood over a 25-year Era of Change
- Linking Ammonium Nitrate-Aluminum (AN-AL) Post-Blast Residues to PreBlast Explosive Materials Using Isotope Ratio and Trace Elemental Analysis for Source Attribution, Technical Summary