Experimental Research on Class Identification with a New Type of Erasable Gel Pens |
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| Authors: | Xinlai Liu MSc Zhen Li MSc |
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| Institution: | 1. Department of Documents Examination, Criminal Investigation Police, University of China, No. 83 Tawan Street, Shenyang City, 110854 China;2. Department of Documents Examination, Criminal Investigation Police, University of China, No. 83 Tawan Street, Shenyang City, 110854 ChinaCorresponding author: Zhen Li, M.Sc. E‐mail: |
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| Abstract: | A new type of erasable gel pen ink is becoming increasingly popular because of the modifiable characteristics for writing on documents. This study attempts to distinguish 12 types of blue and black erasable gel pens produced by mainstream stationery manufacturers using infrared (IR) visual analysis, Fourier transform infrared (FTIR) analysis, fluorescence analysis, and microspectrophotometry. The results demonstrate that IR visual, FTIR, and fluorescence analysis can be used to help distinguish each type of erasable gel ink. While microspectrophotometry can be used to effectively differentiate the blue gel inks in this study, there are limitations with respect to distinguishing black erasable gel pens. When these four optical analyses methods were used in combination, the gel inks could be accurately distinguished. |
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| Keywords: | forensic science questioned documents forensic document examination writing inks gel inks erasable gel pens microspectrophotometry infrared
FTIR
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