国产与进口黑色签字笔墨迹的拉曼光谱比较分析

Comparative Analysis on Black Gel Pen Made in China and Other Countries by Raman Spectroscopy

近几年,文件检验类案件数量呈增长趋势,而在篡改文件和书写时间的检验过程中,经常涉及对黑色签字笔油墨的鉴定。为了为广大文件检验工作者在日常工作中遇到涉及黑色签字笔油墨的案件鉴定提供思路,也为普通老百姓在日常生活中使用黑色签字笔时提出注意事项。本研究采用拉曼光谱技术对常见的62支国产黑色签字笔和42支进口黑色签字笔进行比较分析。结果表明:采用785nm的激发光和532nm的激发光对104支黑色签字笔进行拉曼光谱检验,可以得到不同品牌型号黑色签字笔油墨的拉曼光谱图;根据特征拉曼峰的不同,62支国产黑色签字笔被分为3类,42支进口黑色签字笔被分为10类,每种黑色签字笔的特征谱峰出现位置的重复性好。大多数国产黑色签字笔油墨都含碳,很难得到良好的区分,而大多数进口黑色签字笔油墨为染料,较容易进行区分。

In order to help the document examiners in their daily work on cases involving black gel pen inks,comparative analysis was done on 62 black gel pens made in China and 42 black gel pens made in other countries by using Raman spectroscopy technology.It shows that,all of the 104 black gel pens can get their own Raman spectra under 785 nm or 532 nm exciting light.According to different characteristics of Raman peaks,the62 black gel pens made in China can be divided into three categories,42 black gel pens made in other countries can be divided into ten categories.The inks of most black gel pens made in China are carbon,so it is hard to get good distinguish.While the inks of most black gel pens made in other countries are dye,and it is much easier to be distinguished.