激光显微共聚焦拉曼光谱仪对红色墨迹的研究

目的利用激光显微共聚焦拉曼光谱仪对文书中常见的红色墨迹材料进行表征,研究该方法对红色墨迹材料的区分能力。方法在785nm激发波长,50倍物镜条件下,对49种红色印文,以及9种彩色喷墨打印和13种彩色激光打印的红色墨迹材料进行拉曼光谱表征。结果通过对71种墨迹样品的谱图进行分析,可以发现,红色印文墨迹、喷墨打印红色墨迹及激光打印红色墨迹的拉曼光谱间均存在差异,同时,拉曼光谱可将这三种墨迹材料分别进一步区分。结论显微共聚焦激光拉曼光谱可对红色墨迹材料进行有效表征和区分。这一方法可对红色印文墨迹进行识别,并且可实现对伪造印文文件的鉴别。

Identification of Red inks by in Via Raman Microscope

Objective To characterize and analyze red inks stamped and printed on paper by inVia Raman microscope and to explore the discrimination capability of Raman spectrum. Method Raman spectra were recorded by a Renishaw Raman spectrometer coupled to a 50x object lens with the excitation wavelength at 785 nm. 49 seal inks stamped on papers, 9 color inkjet inks and 13 color laser toners printed on papers were characterized and analyzed. Different dyes contained in those inks were basically identified on the Raman spectra. Result There were significant differences between the 3 kinds of samples prepared with different methods, and the samples in each kind can be further classified. Conclusion Red seal inks and red priming inks on paper can be distinguished by Raman. This work has expanded methods for identification of seal inks, and provide a good method for verify the authenticity of questioned seals.