Analytical & Testing Center of Beijing Normal University, Beijing 100875, China.
Spectrochim Acta A Mol Biomol Spectrosc. 2012 Nov;97:986-94. doi: 10.1016/j.saa.2012.07.127. Epub 2012 Aug 8.
Determination of the red ink entries of seals on documents can provide valuable evidences for solving related crimes, distinguishing the truth of artworks, and so establishment of nondestructive approaches would play a key role in forensic analysis and related aspects. Raman and FT-IR spectroscopy have been applied for analyzing 105 kinds of red ink entries on documents. The dye components of the ink entries were identified by FT-Raman and confocal Raman microspectroscopy, and then the ink entries were classified into four groups based on these dye components. The ink entries were further discriminated by their FT-IR spectra according to adsorption peaks of the main components, the relative intensities of the characteristic bands and the profiles of the spectra. The results showed that 70 ink entries out of 105 have been individually identified and the remaining 35 ink entries can be divided into 13 subclasses. Combination of Raman and FT-IR spectroscopic methods can provide a powerful nondestructive discriminating tool for identification of the red ink entries of seals on papers. These approaches would have potential application in archeology, art and forensic science.
文件上红色印泥的鉴定可以为解决相关犯罪、辨别艺术品的真伪提供有价值的证据，因此建立非破坏性方法将在法医分析和相关方面发挥关键作用。拉曼和傅里叶变换红外（FT-IR）光谱已被应用于分析 105 种文件上的红色印泥。通过傅立叶变换拉曼和共焦激光 Raman 微探针光谱对印泥中的染料成分进行了鉴定，然后根据这些染料成分将印泥分为四组。进一步根据主要成分的吸附峰、特征带的相对强度和光谱的轮廓，用 FT-IR 光谱对印泥进行区分。结果表明，105 种印泥中有 70 种可以单独鉴定，其余 35 种印泥可以分为 13 个亚类。拉曼和 FT-IR 光谱法的结合可以为纸张上红色印泥的鉴定提供一种强大的非破坏性鉴别工具。这些方法在考古学、艺术和法医学领域具有潜在的应用价值。
