What evidentiary information is obtained when the ink used to write a message involved in a crime is compared with the ink recovered from a suspect?

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Comparing the ink used in a message involved in a crime with the ink recovered from a suspect can determine whether or not the inks have consistent characteristics. This can be used as evidence to potentially link the suspect to the crime, as consistency in ink could indicate that the same pen was used to write the message and potentially link the suspect to it. However, the comparison cannot solely identify the suspect or the pen used, as other factors and evidence would also need to be considered.

What Evidentiary Information Is Obtained When the Ink Used to Write