Www ink in datingen
There are four major approaches (each approach is a group of methods) used for dating inks on documents: 1.
The UPV/EHU's research team --comprising the professor of Analytical Chemistry Rosa María Alonso, Dr Itxaso San Román of the Farmartem group of the Department of Analytical Chemistry, and Dr Luis Bartolomé of the Central Analysis Service of Bizkaia (SGIker)-- has developed the Datink method that allows the period of time the ink may have remained on the paper to be determined and its age to be ascertained.
When analysing the kinetics involved in its disappearance, the research group established a pattern that links the state of the ink with the time that has elapsed.
More accurate, less invasive After observing this natural evolution and once the base guideline had been established, the next challenge to be overcome was to check the viability of the method using spontaneously written documents whose exact age was known, such as diaries, laboratory logs and judicial evidence from judicial processes that had been closed.
An ink dating method based on solvent analysis was recently developed using thermal desorption followed by gas chromatography/mass spectrometry (GC/MS) and is currently implemented in several forensic laboratories.
The main aims of this work were to implement this method in a new laboratory to evaluate whether results were comparable at three levels: (i) validation criteria, (ii) aging curves, and (iii) results interpretation.