Objective Since tetramethylbenzidine has substituted benzidine to visualize latent blood fingerprints, it is the preferential choice for developing latent blood fingerprints based on the principle that its oxidized resultant can make the fingerprints of shallow-color or colorless turn into cyan color. But, the fingerprints developed by this method show low contrast when the observed objects are red and even lower the fuscous, are difficult or cannot be photographed. This paper tries to explore a new technique to enhance the development of blood fingerprints on red surface. Methods The solution of 0.25% light green SF yellowish was sprayed onto latent blood fingerprints deposited on red surfaces. The revealed fingerprints were taken pictures, some parts of the fingerprints were further amplified to find out the enhancement effect. Results The light green SF yellowish was very sensitive to develop the blood fingerprints deposited on red surfaces, capable of making 100% visible the samples of latent blood fingerprints prepared in the laboratory. The developed fingerprints showed clear and coherent ridge, distinct contrast without background color and when amplified, the chosen parts of them appearing the features of detail. Conclusions 0.25% light green SF yellowish can effectively visualize latent blood fingerprints on red surface with very distinct contrast.
WANG Yue,HU Shu-liang,LIU Jin.
Visualization of Latent Blood Fingerprints on Red Surface with Light Green SF Yellowish. Forensic Science and Technology. 2015, 40(1): 12-14 https://doi.org/10.16467/j.1008-3650.2015.01.003