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    Ballpoint ink dating heating

    Another important consideration is the ageing of ink deposited on a substrate.

    Once exposed to the environment, compositional changes may rapidly occur due the loss of volatile solvents, photofading of dyes or the polymerisation of resins.

    Thermal ageing was conducted by placing samples into a Zhi Cheng ZXRD-A5055 oven at 100 °C.

    This complexity, while potentially making inks a challenging material to analyse, also makes them good candidates for discrimination based on their different (and often proprietary) formulations.In a similar fashion to infrared and Raman spectroscopy, these methods – when used – also have the advantages of being rapid, non-destructive and requiring little to no sample preparation.Recent studies have employed visible spectroscopy and MSP with chemometrics to provide more objective assessments over visual inspections, and allow the simultaneous comparison of several samples at a time.Guidelines such as those set out by the American Society for Testing and Materials (ASTM), or the Scientific Working Group for Forensic Document Examination (SWGDOC), outline a range of analytical methods suited to the analysis of writing inks.Techniques such as thin layer chromatography (TLC), gas chromatography (GC) or high performance liquid chromatography (HPLC) are frequently utilised in order to separate and identify individual ink components.

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