The visual appearance of inks is only one clue to their composition. Sometimes two inks can look identical to the naked eye but further tests may be able to distinguish between them. Where possible non-destructive tests are used. For example inks can be examined using infra red or ultraviolet reflectance at various wavelengths or using visible light but examining emissions from the ink in the infra red area of the spectrum infra red luminescence. Our examiners use an instrument known as a VSC HR to carry out non-destructive specialised lighting examinations.
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Fee Schedule for Forensic Document Handwriting Analysis by Curt Baggett
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Minimum requirements for application of ink dating methods based on solvent analysis in casework
To the untrained eye, it's just a bunch of blackish liquid with strange names like "moldy sponge" or "green grass. But to the U. Secret Service agents who use the samples, they are the clues that could save the president from an assassination attempt. Or stop a counterfeit ring.
The ink of pens and ink extracted from lines on white photocopier paper of 10 blue ballpoint pens were subjected to ultraviolet-visible UV-Vis spectroscopy, infrared IR , and high-performance thin-layer liquid chromatography HPTLC. The R f values and color tones of the bands separated by thin-layer chromatography TLC analysis used to classify the writing inks into three groups. The principal component analysis PCA investigates the pen responsible for a piece of writing, and how time affects spectroscopy of written ink.