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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.
The primary method of detection of these tags is called XREOF (X-ray excited optical fluorescence).
Information on these tags is confidential and closely kept.
The first ink dating method is the static approach, which determines when the ink being examined was manufactured.
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.
This type of examination is very rarely to never used in actual casework currently.
Ink dating – Alternate Method: Another method for dating inks using thin layer chromatography exists.