摘要
目的通过双溶剂提取法判定印泥印文的形成时间,为判定文件的真伪提供重要依据。方法选用6种不同品牌的印泥和4种纸张分别制作印泥印文的历时性样本,通过实验确定适用于双溶剂提取法判定印泥印文形成时间的弱提取剂和强提取剂;确定薄层扫描时狭缝的大小和扫描波长;绘制盖印时间与提取率的关系曲线。结果弱提取剂为50%的甲酸溶液,强提取剂为N,N-二甲基甲酰胺,狭缝大小为12.00mm×0.60mm,扫描波长为485nm,得到了盖印印文形成后半年内印泥提取率随印文形成时间变化的关系曲线。结论双溶剂提取法是判定印泥印文形成时间的一种有效方法。
Objective To provide important basis for identifying the authenticity of the document by determining the dating of inkpad seals by double solvent extraction method. Methods In this paper, samples of inkpad seals were printed on 4 different kinds of paper with 6 different brands of inks. The strong and weak extraction reagents were selected in the experiment of the double solvent extraction method. The size of slit and scan wavelength were measured, and the relation curve of the extraction percentage of inks with time was drawn. Result Weak extraction reagent was 50% formic acid solution, strong extraction reagent was N, N-dimethylformamide（DMF）, the size of slit was 12.00 mm×0.60mm, the scan wavelength was 485nm. The relation curve within six months of extraction percentage of inks with time was gained. Conclusion Double-solvent extraction method is a useful method to determine the formation time of inkpad seals.
出处
《中国司法鉴定》
北大核心
2010年第2期23-26,共4页
Chinese Journal of Forensic Sciences
关键词
可疑文件
双溶剂提取法
印泥印文
形成时间
suspicious document
double-solvent extraction method
inkpad seal
formation time
