Gaseous Phase Detection of Latent Fingerprint Using Polycyanoacrylate Depolymerization and Volatile Fluorescent Dye

Osamu Shimoda, Masahisa Takatsu, Hiroyoshi Teranishi, Mikio Ouchi
2009 Japanese Journal of Forensic Science and Technology  
A variety of evidence samples have been brought into the Identiˆcation section of the police for detection of latentˆngerprints. Fumes of cyanoacrylate ester are generally used to detect latentˆngerprints on ‰at surfaces, such as cutlery, in a case of murder. Whiteˆngerprint ridgesˆxed by the fumes are generally stained with dye powder or dye solution. We developed new reagents which can detect latentˆngerprints the same method as using both the fumes of cyanoacrylate ester and ‰uorescent
more » ... ng. First, polycyanoacrylate ester powder was produced from its monomer and water as an initiator. Then, 5 percent of p-dimethylaminocinnamaldehyde (DMAC) or pdimethylaminobenzaldehyde (DMAB), each of which has volatility and ‰uorescence that could be excited by ultraviolet light or blue light respectively, was added to the polycyanoacrylate ester powder. The developed reagent depolymerized and yielded monomer at a lower temperature than polycyanoacrylate powder that polymerized in methanol containing 1 water. The mixed DMAC or DMAB can simultaneously stain and give ‰uorescence to the whiteˆngerprint ridge. Added to that, exposing samples to acetic acid vapor for a short time has increased the ‰uorescence intensity and shifted excitation wavelength to a longer one such as ultraviolet to blue
doi:10.3408/jafst.14.21 fatcat:wciaiofgrzdtbhst4b325ij47a