GC Analysis of Black Gel Pen Ink Stored under Different Conditions |
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Authors: | Biao Li M.Sc. Peng Xie Ph.D. Ying‐min Guo B.Sc. Qing Fei B.Sc. |
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Affiliation: | 1. Department of Document Examination, China Criminal Police University, , 110854 Shenyang, China;2. Institute of Forensic Science of the Public Security Bureau of Jilin Province, , 130051 Changchun, China |
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Abstract: | In many criminal and civil cases in China, the most commonly questioned documents are those written with gel pen ink. An important task for forensic document examiners is to identify whether two or more ink entries in one or more documents were written with the same ink type. The identification of the age of gel ink entries made poses an important and difficult problem for forensic document examiners. In this paper, the volatile components of gel ink were determined and the gel ink was classified by gas chromatography with a flame ionization detector. Calibration curves were created to express the relationship between the content of volatile gel ink components and the age of gel ink entries stored under natural and UV‐induced aging conditions. The correspondence between the natural and UV‐induced aging conditions was also established. The experimental results showed that GC was useful in the analysis of black gel ink and applicable for determining the relative age of gel ink entries under certain conditions. |
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Keywords: | forensic science document examination gas chromatography (GC) method gel pen inks UV‐induced aging natural aging correspondence |
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