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These are often very tricky questions to answer and frequently arise in judicial contexts.

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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.Aware of these difficulties, the UPV/EHU team began to work on samples written for research purposes.To do this, they used BIC® ballpoint pens, one of the most common makes and, therefore, the most widely used in documents subjected to legal examination.That is why it is very useful for documents that have been signed as it is possible to compare whether the body of the document, if it has been written by hand, is as old as the signature. Or else it is a very useful tool to date contracts, settlements, wills or other documents.