Nile Blue Improves Crime Scene Fingerprinting

West Australian chemists, at Curtin University, are developing a new technique that could provide crime investigators with a safer, simpler and more versatile method for obtaining good quality fingerprints from non-porous surfaces and in wet or humid conditions.

The compound Nile red is presently used, providing investigators with both contrast and photoluminescence, making it easier to detect fingerprints on non-porous materials. Although proven useful, Curtin University’s Professor Simon Lewis states that this is expensive and the process uses toxic materials that pose health and safety risk to personnel. Professor Lewis’s team of researchers have found that when the compound Nile blue A is made up in water, a small amount converts to Nile red in sufficient quantities to develop fingerprints. Nile blue A is a less expensive reagent and can be used on non-porous surfaces like ceramic, glass, plastics, and adhesive tape.

Professor Lewis also states that while more work needs to be done, testing shows great potential for the new process, particularly in staff training and for use in developing countries. The main objective of his Australian research team is to improve crime scene fingerprinting by finding a way to obtain clear prints from different surfaces and extracting clear prints in wet or humid conditions.

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Source: Science Network Western Australia

[Abstract written by Noel Andres, ForensIQ Intern 2/27/14]