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Enhancement of cyanoacrylate-developed marks using p-dimethylaminobenzaldehyde (DMAB) on semi-porous surfaces and analysis of the influence factors on fluorescence intensity
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
2014, v.27 no.4, pp.187-195
https://doi.org/10.5806/AST.2014.27.4.187
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(2014). Enhancement of cyanoacrylate-developed marks using p-dimethylaminobenzaldehyde (DMAB) on semi-porous surfaces and analysis of the influence factors on fluorescence intensity. Analytical Science and Technology, 27(4), 187-195, https://doi.org/10.5806/AST.2014.27.4.187
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Abstract
It is very important to minimize the damage of latent fingerprints at enhancing the contrast. This studyproves the enhancement effects of cyanoacrylate-fumed latent fingerprints using p-dimethylaminobenzealdehyde(DMAB) on semi-porous surfaces and the influence factors. The latent fingerprints in experiment were developedfor cyanoacrylate treatment in a vacuum chamber and used after drying at room temperature for 24 hours. For fluorescence staining, the cyanoacrylate-developed marks using DMAB were sublimated during 48 hoursunder the different conditions of surface area, temperature, atmospheric pressure. First experiment showed howsurface area effects on the sublimation rate and fluorescence intensity by DMAB of particle size and containersize. In addition, the fluorescence staining using DMAB with solvent-free contact method had the greatestfluorescence intensity after 36 hours and a low fluorescence intensity over a certain size of surface area. Secondexperiment showed that the evaporation of DMAB solid crystals got a satisfying result in a temperature of20 oC and reduced time to get the greatest fluorescence intensity. It took a long time to get a optimum levelof fluorescence intensity at 30 oC or more and it was less effective in fluorescence intensity. Third experimenton the pressure indicated that the fluorescence intensity of vacuum was weaker than nonvacuum but it wasinapplicable to very high variations in pressure.
- keywords
- p-dimethylaminobenzealdehyde, cyanoacrylate fuming, vapor-phase staining, enhancement, semi-porous
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