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Ink analysis is performed to determine if two inks are similar or different, to determine the manufacturing source of an ink, and to date an ink.
For the latter two tasks, it is necessary to have a collection of reference standards; it is also needed when inks are found to be similar and one needs to know how rare or common that ink is.
Here a match suggests the identity of an ink for which one has the manufacturing information such as the first date of production.
The second involves the examination of features that change with age such as the evaporation of ink solvents and the degradation of dyes. One estimates the age of an ink by comparing the ink with itself before and after inducing aging (e.g., by heating).
More recently, investigations have focused on the solvent loss ratio of PE prior to and after heating.