Vapor-phase staining of cyanoacrylate-fumed latent fingerprints using p-dimethylaminobenzaldehyde |
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Authors: | Takatsu Masahisa Shimoda Osamu Teranishi Hiroyoshi |
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Institution: | Forensic Science Laboratory, Hyogo Prefectural Police Headquarters, Chuo-ku, Kobe, Japan. masahisa_takatsu@ybb.ne.jp |
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Abstract: | Contrasting or enhancing of cyanoacrylate ester-fumed latent fingerprints deposited on solvent-sensitive materials such as oil marker writings and rough surface materials such as unglazed earthenware is not easy by conventional dye solutions dipping or dye powder dusting. In this study, a new vapor-phase staining method using p-dimethylaminobenzaldehyde (DMAB) is proposed for staining such materials. DMAB has high volatility and selective absorbability to cyanoacrylate-fumed fingerprints, so that cyanoacrylate-treated samples can be easily stained by leaving them simply in a closed container along with DMAB crystals for 48-96 h at room temperature or in conjunction with the use of mild heating. The stained fingerprint could be excited by UV irradiation (365 nm), and the fluorescent fingerprint was photographed through a UV cut-off filter (420 nm). The new method achieved minimally destructive fluorescent staining for the solvent-sensitive samples and the rough surfaced samples. |
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Keywords: | forensic science latent fingerprint p‐dimethylaminobenzaldehyde vapor‐phase staining cyanoacrylate fuming |
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