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.Multiple solid-phase microextraction (MHS-SPME) coupled to GC/MS was used to measure the solvents from ink entries made with four BIC parameter, the remaining fraction of the analyte in the system after one equilibration, corresponding to the successive extractions was considered for modelling a mathematical equation for later ink age dating.Preliminary tests of DATINK method showed that it was possible to detect the presence of ink solvents on documents up to the studied five years.The chemical analysis of writing and printing inks, as well as paper, can be invaluable when trying to prove whether a document is fraudulent.Ink dating is a highly specialized forensic examination and considered to be one of the most accurate and reliable methods to help determine the age of a document. has extensive experience as a forensic chemist and document dating specialist.Relative age comparison tests performed on inks of the same formula and written on the same type of paper with the same storage conditions (performed by measuring changing solubility properties of inks) can estimate how long inks have been written on paper.This is done by: (1) comparing the rates and extents of extraction of questioned and known dated inks in organic solvents by thin-layer chromatography (TLC) densitometry; (2) comparing changes in dye concentrations by TLC and TLC densitometry; and (3) comparing the volatile ink components by gas chro-matography-mass spectrometry (GC-MS).
Modern inks of type (2) contain synthetic blue dyes to provide an immediate blue color to the ink which gradually turns black after oxidation on paper.In cases where known dated writings are not available for comparison with questioned inks, accelerated aging (heating the ink to induce aging of the ink) can sometimes be used to estimate the age of ink using any or all of the above described techniques.Iron-based inks can be dated by measuring the migration of iron along the fibers of the paper by Scanning auger microscopy. Author of many peer reviewed research articles and publications. Offices: San Luis Obispo, CA-GFS is a private forensic lab, specializing in ink dating, forensic ink dating, ink age, questioned documents, fraud, forgery, art age determination, ink, paper, handwriting, fingerprints, counterfeiting, piracy, crime scenes, Daubert and court preparation. S., Ink Chemist & Document Dating Specialist, highly qualified expert in ink age determination, ink chemistry and all areas of forensic document examination (excluding handwriting).It is made into a liquid for writing by grinding the cake and suspending the particles in a water-glue medium. Liquid carbon inks are also commercially available.