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When it can be determined that an ink came into manufacture on a certain date, it can be inferred that the writing made by that ink occurred either on or after the first date of manufacture.However, this type of analysis is relevant only to very old documents.Not all published methods are reliable, however, and some have been heavily criticized (Hofer, 2004).
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.
The ink dating static approach is typically more useful as the difference between the date on the document and the present time increases.
Several different tests exist in this form of ink dating.
Chemical and physical analysis of inks on questioned documents provides valuable information regarding their authenticity.
Comparison of these chemical and physical properties of two or more inks can determine: (1) if the inks were made by the same manufacturer; (2) in some cases, whether the inks are products of the same production batch; and (3) the first production date of the specific ink formulation involved.
Some ball-point pen manufacturers add ‘dating tags’ to their inks as a means of being able to identify the year in which the ink was made.