[Determination of writing age of blue ballpoint pen inks by high performance liquid chromatography].
As it is a frequently encountered problem in the laboratory of forensic science nowadays to distinguish whether the questioned documents, such as deeds, contracts, and receipts, written in ballpoint pen inks are true or not, and identify the writing age of them, it is very essential to establish a simple, sensitive and accurate method to examine the similarities and differences of the ballpoint pen inks and identify the writing age. The present paper introduces a technique that allows identifying the kind and the writing age of the blue ballpoint pen inks. The technique is based on using a high performance liquid chromatographic method for distinguishing the similarities and differences in dyes of blue ballpoint pen inks and determining changes in dyes of blue ballpoint pen inks developed with age, and these changes can be evaluated by the ratio of peak areas.
Shi
Xiao-Fan
XF
China Criminal Police College, Shenyang 110035, China.
Li
Xin-Qian
XQ
Xu
Ying-Jian
YJ
Wang
Jing-Han
JH
Wang
Yan-Ji
YJ
D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D004396:Coloring Agents / Q000032:analysis* / Q000737:chemistry; D044707:Forensic Sciences / Q000379:methods; D005840:Gentian Violet / Q000032:analysis / Q000737:chemistry; D007281:Ink; D008956:Models, Chemical; D015394:Molecular Structure; D015203:Reproducibility of Results; D013997:Time Factors; D014956:Writing
D004396:Coloring Agents; D005840:Gentian Violet