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.
One of the calls that Southworth received was from Mr. Dawson, a Forensic Document Examiner with Dawson Document Laboratory, L. For example, there are times when one party in a probate dispute will allege a “page” was inserted in a Will thereby changing the distribution of the estate to benefit an individual “the family knows the decedent despised.” Other times several family members may submit a different Will to probate, each Will bearing a different date.
For the average examiner paper analysis alone does not resolve the question.
Similarities in paper type, colour, content, fibres, sizes etc can yield valuable information when determining similarities or differences between papers.
The types of pen, printers etc may be significant in assessing the date of a document and as with many of the dating techniques, the evidence is often more valuable or significant when an anachronism is established as opposed to compliance with other materials, papers etc which may have been available for a prolonged period of time.
The age or common origin of the document(s) may be determined through typewriting, printing, handwriting or even ink analysis; however, many times the problem may be quickly solved if a watermark is noted on the documents(s).