Analysis of Writing Ink Dyestuffs by TLC and FT-IR and Its Application to Forensic Science.

TSUTSUMI Kazuhiro, OHGA Kazuya

doi:10.2116/analsci.14.269

Analysis of Writing Ink Dyestuffs by TLC and FT-IR and Its Application to Forensic Science.

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TSUTSUMI Kazuhiro

Criminal Investigation Laboratory, Oita Prefecture Police Headquarters
OHGA Kazuya

Department of Applied Chemistry, Faculty of Engineering, Oita University

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タイトル別名

Analysis of Writing Ink Dyestuffs by TL

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Black, blue and red writing pens were classified into various groups using the R_f values and color tones of dyestuff bands separated by normal-phase thin-layer chromatography (TLC) of their inks. The classification is effective for the preliminary identification of pens used in crime scenes. A microsampling technique was proposed for the TLC analysis of minute quantities of inks on questioned documents. Furthermore, a combination of reflectance-mode microscope/Fourier transform infrared spectroscopy and the pin-point condensation technique was proved to be useful for the precise discrim-ination of trace amounts of analogous water-soluble dyestuffs on TLC plates.