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What is more, the new technique reduces the number of punctures needed to analyse the writing on a document to just one.
The problems Determining the age of a document to find out whether it is authentic is a task influenced by the type of paper on which it has been written, the pressure of the stroke -the amount of ink deposited when the writing was done- or even the technique used.
So Datink has overcome some of the drawbacks graphology examination comes up against when ascertaining the age of a document by means of other methods.
Aware of these difficulties, the UPV/EHU team began to work on samples written for research purposes.
In fact, the dating of documents is a key area in the field of forensic science.
These are often very tricky questions to answer and frequently arise in judicial contexts.
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.
But this technique is also able to overcome other stumbling blocks relating to the amount of ink deposited when writing and the type of paper used, as these variables hamper the dating of a document by means of traditional methods.