Ink age dating
In recent years, several ink dating methods have been proposed.These methods have been based on the analysis of common ink solvents using gas chromatography/mass spectrometry (GC/MS) as the analytical platform.For example, if transfers of ink are found on several pages of a diary, it indicates that the corresponding entries on the diary were made in a single sitting, not over a longer period as suggested by the dates.Ink and Toner Intersections – When a signature (or a handwritten notation) intersects a printed text on a document, a forensic document examiner may be asked which came first, the text or the signature (handwritten notation).
Iron-based inks can be dated by measuring the migration of iron along the fibers of the paper by Scanning auger microscopy.
This article describes state of the art procedures for the chemical and physical comparison, identification and dating of inks on questioned documents.
Knowledge of the composition of inks is necessary to understand the reasons for the various methods used to analyze inks.
This method can be useful only when the inks are still drying (up to six years but more likely one to two years) as solubility changes cease once ink has completely dried.
Additionally, as resins in inks harden, which begins on deposit, their solubility diminishes and importantly they trap colourants.
Search for ink age dating:
Other ink entries are not necessary for comparison. Aginsky has developed the SET as a result of many years of research of the ink aging methodology developed and published by Dr. For example, if the questioned document’s date precedes the manufacturing date for the ink used to sign the document, it is established that the document could not have been signed on the date it bears. Such intra-comparisons of inks may reveal that the questioned entries were not written contemporaneously with the other entries in the file (document). – The examination’s purpose is to assess whether the use of various inks on the document(s) fits a pattern that is either consistent with the dates appearing on the document(s) or indicates preparation "at one time" (during a short period of time). Paper folds – It is often possible to determine whether an ink line that intersects a paper fold was written before or after the paper was folded.