高效液相色谱法鉴别黑色签字笔墨水字迹形成时间的研究

Identification of the Aging of Black Signing-pen Ink Writing by High Performance Liquid Chromatography

采用高效液相色谱法对在室温暗处保存的不同形成时间的黑色签字笔墨水字迹色痕进行了分析,通过染料成分相对含量的变化来确定黑色签字笔墨水字迹色痕的相对形成时间;并且在强光灯及室内自然光下对黑色签字笔墨水字迹进行了人工老化处理,通过光照老化实验得出染料的变化规律,为字迹形成时间的鉴定奠定了基础。

The identification of relative age of the ink entries written by the same black signing-pen on documents stored in different light conditions is presented. The documents were stored in darkness and exposed to daylight and artificial light from 500 W visible analyzer for quite a number of days, respectively. Inks were then extracted from the respective documents and analyzed by HPLC. The variations of the relative contents of the dye component in the ink extracted from the documents under different light conditions were further studied. The variation regularities of the dye component under different aging conditions thus obtained would be the basis for the identification of the aging time of the ink entries written by the black signing-pen on documents.