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The procedure most commonly used for the detection, isolation, and analysis of these date tags in ink dating is: The comparison between the known tag and the questioned ink being examined should focus on whether the florescent compounds are the same color in the known and questioned.

No more than three of the four tags were ever used in a given year.

Other pages discuss the use of infrared to discriminate the differences between inks that visually and microscopically look identical.

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This single tag was later expanded to four tags, A, B, C, & D.

By the combination of the presence or absence of each tag either a specific year or a range of years could be established.

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.

Other times the results will disclose a range of a few years as possibilities the ink could have been made.

These results should then be photographed using ultra-violet light and color film for presentation at a later time if required.

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.

This was a single tag was could be extracted with the ink, separated and analyzed with ultra-violet light.

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

The determination of the type of writing instrument is probably the oldest method of ink dating.

This ink dating method primarily involves microscopic examinations and can also incorporate some basic chemical solubility testing.

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.

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