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On one hand, we were asked, if the cash book had been kept on account consecutively during the period of one year, and on the other hand, the judges were interested in knowing, if the document could have been written in 2003 and back dated to 2000.To answer these questions, the document was examined for latent elements by electrostatic detection device (ESDA).Another problem is the ink composition at the time of the writing process.Ink composition ratios within different ballpoint pen types may vary on a large scale even if their dye ingredients are the same. By definition, a cash book has to be written by hand and the entries have to be made daily. 6 Paper ID JFS2004056 Available online at: org CASE REPORT R. The questioned document was a list of 29 pages containing a consecutive handwritten numbering and dated entries (payments) made of blue ballpoint pen ink. Dating of Ballpoint Pen Ink ABSTRACT: In this paper we describe a case in which a cash book, dated of the year 2000, was sent to the Forensic Science Division, Document Laboratory, Zurich Canton Police in March 2003.

Determining ink sources used on a variety of documents is a key priority for forensic document examiners.

1 Forensic Science Division, Document Laboratory, Zurich Canton Police, 8021 Zurich, Switzerland. 2004; and in revised form ; accepted ; published 5 Oct. Reference collections of standard ink lines on paper that have been stored in controlled conditions for natural aging are often used for the calculation of aging curves.