Dating ink on paper

Published: 06.07.2017

This allows a direct comparison of the composition of inks being examined on the same TLC plate. Lawyers should be interested in the forensic examination of disputed records for three reasons:

To date ink entries to determine whether documents have been back-dated. Nondestructive methods of comparison should be carried out first, because chemical analysis causes minor damage to the document by removing ink samples for analysis. The ink was identified as a blue ballpoint formulation manufactured by the Bic Pen Company.

For this ink the solubility properties as measured by the R-ratio and percent extraction methods did not change after 4 years. Liquid carbon inks are also commercially available. Relative age comparison tests performed on inks of the same formula and written on the same type of paper with the same storage conditions performed by measuring changing solubility properties of inks can estimate how long inks have been written on paper.

Ink dating — fourth case example — The fourth example was a portion of evidence in a case that contained a mountain of evidence showing that some engineering notebooks were added to and written after the fact. Tags have been added to some ballpoint inks by the Formulab Company since before ; however, the use of tags in their inks was discontinued in June The chemical analysis of writing and printing inks, as well as paper, can be invaluable when trying to prove whether a document is fraudulent.

Fun with Ink & Screentone!

However, the results of the TLC test showed that the questioned ink was a different formulation than any other entry in the entire diary. If the inks are different, one ink will luminesce while the other will be infrared opaque or filter. A thin layer chromatography examination was conducted on the two questioned entries and compared to the writings known to have been written by the doctor denying authorship, as well as several dozen comparison samples from other writers throughout the chart.

The difference in the ink in this range of lights is caused by the different excitation levels in the inks. Many other similar examples exist.

    1. Benedetto_Corleone - 16.07.2017 in 08:42

      The second ink dating approach analyzes the chemical composition of inks on a contested document with the aim to determine whether these inks as well as other materials used to produce the document — paper, inkjet printing ink, toner, stamp pad ink, etc. The most modern inks of this type contain pigmented dyes, such as copper phthalocyanine introduced in about which makes these inks much more permanent.

      Konstantin_Winston - 19.07.2017 in 03:22

      The physical characteristics of these inks are quite different from the standard glycol based ballpoint inks.

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