Ink dating brunelle
Spectroscopically generated curves are plotted as the ratio of reactants to products, versus time.The spectral characteristics of the ink are determined in units of percent reflectance of the active compounds in the ink so that the age of the ink can be computed by reference to known reaction rates.The first mechanism relates to detecting color shifts of p H sensitive compounds in the ink as the result of the evaporation of certain acidic or basic chemicals thereof.The second mechanism relates to the oxidation of compounds in the ink.Then, strokes from the same ballpoint were aged naturally in the dark or under the influence of light over one year and then analyzed.The results show that the degradation of these dyes strongly depends on light fluence.A plurality of dyes having differing reaction rates may be added to the ink to enable precise measurements to be made over different time intervals.2.
It was suggested that there are several competing bond breaking and bond forming reactions corresponding to the characteristic vibration frequencies of the dye molecule that simultaneously occur during ink aging process. Kochemirovsky" The development of methods of analysis of documents on the basis of the methods of Raman spectroscopy and fluorescence analysis ", Proc.
The method recited in claim 1 including the additional step of adding to the ink to be deposited on the writing surface a chemical which is susceptible to oxidation when exposed to the air for causing the color of said ink to change between said first and second times.4. In this regard, time dating an ink is dependent upon the composition of the ink and may be determined through analysis such as solvent extraction and spectroscopy.
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.
Lecturer at numerous scientific and legal organization meetings to include the American Academy of Forensic Sciences, American Society of Questioned Documents Examiners, California Association of Criminalists, International Association of Forensic Scientists.
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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.