What is ink dating
E’lyn (2001), in her overview of the basic techniques and technology of questioned document examination, revealed that two new methods of determining the relative age of ball point inks had come to the forefront in forensic document examination. The new method for analyzing the drying time of ink was through chemical analysis. It is now possible to identify the age of the ink to within a six–month period. Ball pen inks are made up of colorants (dyes and pigments) and a carrier (vehicle). The carrier contains most of the substances that age or change with time. Many attempts have been made to determine the age of ink in the last 30 years.
One of the challenges faced by the forensic document examiner is determining the age of a document/ink in order to ascertain whether entries or writings – such as those in logbooks, registers, OMR sheets, deeds, cheques, drafts, and other important documents – were executed in the same period or in different periods of time. By Nato Locktongbam Central Forensic Science Laboratory, Directorate of Forensic Science Services, Ministry of Home Affairs, Government of India, Kolkata Dr. In order to address these challenges, an attempt was made to study the rate of diffusion of inks at different time intervals using hyperspectral imaging. Khound Directorate of Forensic Science, Government of Assam, Guwahati Priyankar Ghosh Central Forensic Science Laboratory, Directorate of Forensic Science Services, Ministry of Home Affairs, Government of India, Kolkata Abstract The challenges faced by the forensic document examiner are to know whether entries/writings with ink made on certain documents – such as logbooks, registers, OMR sheets, cheques, drafts, promising letter/notes, deeds, wills, prescription notes, and other important documents – are executed during the same period of time, or in different periods of time, and to know whether entries/writings were executed by the same ink. HSI is a standard digital imaging technique with common spectroscopic methods, such as Near-IR, visible and fluorescence imaging that provides increased sensitivity and discrimination capabilities over traditional imaging and detection methods. Studies on the degradation of blue gel pen dyes by ion-pairing high performance liquid Chromatography and electrospray tandem mass spectrometry. HSI uses reflected, transmitted, or emitted light from each point in the sample image to create a spectral-based contrast within the image (Chem Image, 2011).
Often, we come across the terms “static/absolute” or “dynamic/relative” in regard to the aging process.