Identification of the Crossing Sequence of Seal Stamps and Ink of
Handwriting/Printed Documents Based on Raman Spectroscopy
WAN Jing-wei1, CHEN Lei2, CHAI Wei3, KONG Wei-gang4, CUI Sheng-feng1
1. Department of Criminal Science and Technology, Zhengzhou Police University, Zhengzhou 450053, China
2. Department of Pharmacy, Henan Medical College, Zhengzhou 451191, China
3. College of Criminal Science and Technology, Shenyang 110854, China
4. Institute of Forensic Science, Zhengzhou Public Security Bureau, Zhengzhou 450016, China
Abstract：The identification of the sequence of seal stamps and ink has always been a hot and difficult issue in the research and practice of forensic document examination, which could prove the authenticity of the documents and infer whether the documents are consistent with the facts of the case, thus providing a legal basis for the judicial department to investigate and judge the case. The common identification methods include optical microscopes, fluorescence, document inspection, and computer software-assisted methods. The identification conclusion is easily influenced by subjective experience and is questioned due to its lack of objectivity. In this study, based on the preparation of 54 handwriting samples of 3 types of signature pens and 9 types of seal stamp combinations, 18 printed samples of laser printed, and 9 types of seal stamp combinations, the samples were tested by Confocal Microscope Raman Spectrometer. The optimal condition was obtained from the handwriting samples (10# Pilotg-1) and seal stamps (1# Print show). The 72 prepared samples were placed in a dark storage box for one year. Under this optimal condition, the Raman spectrum of four measuring sites in the sample, followed by ink before seal stamps, seal stamps before ink, seal stamps, and ink, were measured, and each sample was tested three times. The experimental results were unaffected by storage environment or paper background factors. Whether handwriting or printed samples, the intersection of ink before seal stamps displayed some of the characteristics of the seal stamps. At the same time, the intersection of seal stamps before ink displayed some of the characteristics of the ink. The Raman spectra of the intersection showed most of the Raman shifts of the corresponding seal stamps or ink on the upper layers, consistent with the observation of μ View under a 20× objective lens. Raman shift of the sample was compared to identify the crossing sequence of seal stamps and ink of handwriting/printed. The results show that the novel method is convenient, quick, non-destructive, highly sensitive, and accurate and has practical guiding significance for identifying the crossing sequence of seal stamps and ink.
Key words：Raman spectrum; The crossing sequence of seal stamps and ink; Handwriting/printed document; Nondestructive inspection
万敬伟，陈 蕾，柴 威，孔维刚，崔胜峰. 基于拉曼光谱鉴定书写/打印文件的朱墨时序[J]. 光谱学与光谱分析, 2024, 44(09): 2501-2505.
WAN Jing-wei, CHEN Lei, CHAI Wei, KONG Wei-gang, CUI Sheng-feng. Identification of the Crossing Sequence of Seal Stamps and Ink of
Handwriting/Printed Documents Based on Raman Spectroscopy. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2024, 44(09): 2501-2505.
[1] XIE Liu-yang, XIE Ming-ren(谢刘阳, 谢明仁). Guangdong Public Security Technology(广东公安科技), 2020, 28(3): 14.
[2] Lewis J. Forensic Document Examination: Fundamentals and Current Trends. San Diego, US: Academic Press, 2014.
[3] TAO Yu, WU Li-zhi, XIE Peng(陶 玉, 武立志, 谢 朋). Journal of People's Public Security University of China (Science and Technology)[中国人民公安大学学报(自然科学版)], 2017, 23(1): 10.
[4] LI Fu-kun, ZHOU Zhi-dao, WEI Yuan-song, et al(李福坤, 周治道, 魏源松, 等). Journal of Changchun University of Science and Technology (Natural Science Edition)[长春理工大学学报(自然科学版)], 2021, 44(4): 131.
[5] XIE Peng, LI Biao, LUO Qiong(谢 朋, 李 彪, 罗 琼). Journal of People's Public Security University of China Science and Technology(中国人民公安大学学报自然科学版), 2012, 18(2): 16.
[6] LIU Chong, YANG Shang-peng(刘 聪, 杨尚鹏). Papermaking Equipment & Materials(造纸装备及材料), 2021, 50(9): 150.
[7] WANG Shao-fang(王少仿). Forensic Science and Technology(刑事技术), 2015, 40(4): 291.
[8] CAO Shu-rui, XU Jia-yu, TIAN Jie, et al (曹淑瑞，徐嘉屿，田 洁，等). Journal of People's Public Security University of China (Science and Technology)[中国人民公安大学学报(自然科学版)], 2023, 29(3): 1.
[9] Wu X. Journal of Forensic Sciences, 2024, 69: 966.
[10] Wu X, Li B, Ouyang G L. Journal of Forensic Sciences, 2021, 66(4): 1545.
[11] LIAN Yuan-yuan, LIANG Lu-ning(连园园，梁鲁宁). The Journal of Light Scattering(光散射学报), 2016, 28(3): 245.
[12] WAN Jing-wei, CUI Sheng-feng, CHEN Lei, et al(万敬伟, 崔胜峰, 陈 蕾, 等). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2020, 40(4): 1156.
[13] JI Kang, ZHAO Jie(籍 康, 赵 杰). Journal of Nanjing Normal University (Natural Science Edition)[南京师大学报(自然科学版)], 2010, 33(4): 68.
