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.
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.
In fact, the dating of documents is a key area in the field of forensic science.
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