Dating pen ink

In this case, another expert disagreed with the identification of this ink. The detection of a chemical date tag can disclose the exact year that the ink being examined was manufactured. This case was somewhat unique in the manner in which the evidence was collected and submitted. There were many entries throughout four books some involving these allegations and many that did not. Julie Howenstine George F. The receipt had to have been written in or later. In the following real case examples, one can see the manner in which the three thin layer chromatography tests can be used to aid in examinations.

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If similar ink was found elsewhere in the diary, a relative ink age comparison test could have been conducted to determine when the questioned entry was written.

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Dating of ballpoint pen ink.

The best way to establish the degree of differences that can be caused by different batches of the same formulation is to run many samples of the same ink that is known to be different batches. Similarities are noted in samples 3, 6 and 16, as well as in samples 4 and 7 and samples 15 and Another method for dating inks using thin layer chromatography exists. The ink library approach, as it is commonly referred to, comprises the other portion of the static approach to ink age determination. In this paper we describe a case in which a cash book, dated of the yearwas sent to the Forensic Science Division, Document Laboratory, Zurich Canton Police in March The three methods of comparison that are used are one or more of the following:

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