V n aginsky dating and characterizing writing
The aim of this work is to characterize the degradation processes of methyl violet and ethyl violet, two typical ballpoint dyes by using laser desorption/ionization (LDI) and matrix-assisted laser desorption/ionization (MALDI) mass spectrometry (MS), and to evaluate the possible application of the method to forensic examination of documents.
Keywords:inks;writing inks;printing inks;ink-jet inks;toners;thin-layer chromatography;ink aging;accelerated aging;induced aging;dye degradation;solvent evaporation;dyes;pigments The relative aging of ink is the comparison of inks of the same formula and on the same paper to ascertain the order in which they were written.
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.
The solvent extraction technique determines how efficiently an ink is extracted into a solvent.
This efficiency involves both the rate and extent of extraction and is dependent on the time the ink was placed on the document. [Show full abstract]Data provided are for informational purposes only.