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The dating of ink is done in two primary forms. The first is the static approach, which determines when the ink being examined was manufactured. The second 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.

The plate above is a high performance thin layer chromatography (HPTLC) silica gel plate demonstrates the variation in several samples of blue non-ball point inks. Two manufacturers' with several different formulations are present (samples #1-11,16 and samples #12-15,17). Similarities are noted in samples #3, 6 and 16, as well as in samples #4 and 7 and samples # 15 and 17. These similarities are attributed to the similarities seen in a given manufacturer's product formulations.

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