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1170–1250), who grew up in North Africa and is credited with introducing the decimal system to Europe, used the term zephyrum.This became zefiro in Italian, and was then contracted to zero in Venetian.Specifically, they focussed on the solvent known as 2-phenoxyethanol (PE), present in 80% of the inks in ballpoint pens of this type.Itxaso San Román, Luis Bartolomé and Rosa María Alonso allowed the chemical compound to age under normal conditions, without ageing it artificially, which is what happens in other methods, and studied its evaporation speed.In these cases, significant dating errors occur because the type of paper used and the mass/quantity of the ink deposited influence the analysis.Likewise, the team that has developed this new method has managed to obtain results using minimal amounts taken from the document. A new method that determines the age of a document in a less invasive way than other techniques and is also able to date documents up to five years old.

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.For the simple notion of lacking, the words nothing and none are often used.Sometimes the words nought, naught and aught are used. 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.