Method of identifying ball pen ink writing forming time by chromatography

Abstract

The present invention belongs to the field of material evidence analysis technology in court science, in particular, it relates to a method for determining ball-pen ink writing formed time by utilizing chromatographic process. Said method includes the following steps: (A). extracting writing; and (B). making determination by adopting following processes; (1). using GC method to determine solvent component to define ball-pen ink variety; (2). using UV-VIS spectrography to determine the dye used as internal standard material in the ball-pen ink so as to define the variety of said ink; and (3). using HPCL method to determine dye composition to define variety of said ink; and (C) defining relative formed time of the writing and absolute time.

Description

technical field [0001] The invention belongs to the field of forensic science evidence analysis, in particular to the field of methods for identifying the formation time of ballpoint pen ink writing by chromatography. Background technique [0002] With the deepening of my country's reform and opening up, various types of corruption crimes and economic cases have a clear upward trend, and major and important cases have increased significantly, involving fraud, corruption, and tax evasion cases involving millions, tens of millions, or even hundreds of millions of yuan. Happens frequently. In all kinds of economic cases and disputes, the perpetrator or the parties often use the ballpoint pen to forge the time of the nominal document on the original text afterwards, so as to escape the crime and tamper with the facts. In this case, the ink of the ballpoint pen is used to make the document The only basis for identifying the authenticity of the document is whether the time of the ...

AI Technical Summary

Problems solved by technology

Determine the formation time of ballpoint pen writing by the amount of solvent in the ink writing of the ballpoint pen. The disadvantage of this method is that it can only identify samples with a formation time within 6 months, and a comparison sample is necessary