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The Bic Cristal is a popular disposable type of ballpoint pen whose design is recognised by its place in the permanent collection of the Museum of Modern Art, New York.

During the identification of ink compound, by using LC/MS, a statement was made that each ink sample contains 2-phenoxyethanol as a solvent, Methyl Violet and Basic Blue dyes and their degradation products.The areas of peaks gained at characteristic wavelengths are used for the analysis of the aging process.In alcuni lavori (bibliografia 13) si conclude, proprio sulla base di 2 differenti approcci (uno lento ed uno veloce) che forniscono risultati significativamente diversi, sulla relativa impossibilità di datazione accurata degli inchiostri deposti.In ogni caso è pressoché impossibile stabilire se due diverse scritture siano state apposte nell’arco di breve tempo l’una dall’altra (ore o giorni).È possibile invece la sequenza temporale dei tratti grafici che stabilisce se una scrittura, ad esempio una firma, è stata apposta prima o dopo un’altra. cookies, tags, and tracking settings to store information that help give you the very best browsing experience.

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Many attempts have been made to determine the age of ink in the last 30 years.

Different techniques have been used, based on the study of chemical and physical properties of various types of inks.

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.

The study was carried out to quantify the amount of ink diffusion using luminosity as a parameter at different intervals of time by preparing a Common Reference Index Value (CRIV) and to assess whether particular writings were made at the same period of time.