Labritory document dating

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Until now, document dating methods have been able to indicate whether the writing was relatively new (less than 90 days) or older (over two years), yet this chronological accuracy is insufficient in certain cases, above all in judicial ones.

Aware of these difficulties, the UPV/EHU team began to work on samples written for research purposes.

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.

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This ink dating method primarily involves microscopic examinations and can also incorporate some basic chemical solubility testing.

The types of pen, printers etc may be significant in assessing the date of a document and as with many of the dating techniques, the evidence is often more valuable or significant when an anachronism is established as opposed to compliance with other materials, papers etc which may have been available for a prolonged period of time.

Other aspects of documents relating to defects in features such on printed or typewritten document, the presence of trash marks or incidental marks on photocopies or laser prints etc may also yield valuable information concerning the dating of the document.

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.

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