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Ink dating

This would be significant if the date the ink was first available is after the date the ink was purportedly written.

With inks available in common production this is much easier than with inks that are rare.

Any differences that the examiner attributes to differences in batches when making an identification or elimination should be demonstrable in some manner.

The first ink dating method is the static approach, which determines when the ink being examined was manufactured.

The second ink dating method is the dynamic approach, this method is to determine when the writing occurred, or in simple terms, how long the ink has been on the paper.

This involves the comparison of the questioned ink being examined to a known library of inks to determine the manufacturer and formula of the ink.

Then by researching the library information or contacting the manufacturer an exact date of commercial availability can be established.

Color slide film has been shown to work well, especially since a print can be made directly from a slide or used in a projector for presentation.

Ink dating 1970’s and 1980’s: In the 1970’s and 1980’s, several ink manufactures used rare earth metals as a method to tag inks as to their date of production.

The next step would be the most basic ink dating form of thin layer chromatography (TLC) testing to determine if two or more inks are the same or different formulations.

In order to do this the following steps are taken: Ink dating – chemical tag: The detection of a chemical date tag can disclose the exact year that the ink being examined was manufactured.

For this reason this type of tag is commonly referred to as a florescent date tag.