Dating documents forensics
Differentiating inks can be important in cases where a document is suspected of having been altered.A classic example is where a zero is added to a cheque making the value ten times as much.Osborn Award of Excellence” by his peers in recognition of his contribution to the field of questioned document examination.Full details about this award are available at the following website
This means that we can use high end techniques to examine inks such as Matrix Assisted Laser Desorption Ionisation Time of Flight Mass Spectrometry.
Documents that don’t contain visible identifiable marks may contain valuable impression evidence if they were underneath other documents when the writing was performed.
Even documents that were shredded or burned may prove useful if reconstructed.
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. 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).