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    In-situ studies into the characterisation and degradation of blue ballpoint inks by diffuse reflectance visible spectroscopy

    226943_226943.pdf (1.571Mb)
    226942_226942a.pdf (454.8Kb)
    Access Status
    Open access
    Authors
    Sauzier, G
    Giles, Peter
    Lewis, Simon
    van Bronswijk, Wilhelm
    Date
    2015
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Sauzier, G. and Giles, P. and Lewis, S. and van Bronswijk, W. 2015. In-situ studies into the characterisation and degradation of blue ballpoint inks by diffuse reflectance visible spectroscopy. Analytical Methods. 7: pp. 4892-4900.
    Source Title
    Analytical Methods
    DOI
    10.1039/C5AY00761E
    ISSN
    1759-9660
    School
    Department of Chemistry
    Remarks

    This open access article is distributed under the Creative Commons license http://creativecommons.org/licenses/by-nc/3.0/

    URI
    http://hdl.handle.net/20.500.11937/40085
    Collection
    • Curtin Research Publications
    Abstract

    35 blue ballpoint inks sourced from Western Australian retailers were deposited onto commercial copy paper and analysed using diffuse reflectance visible spectroscopy. Principal component analysis showed that while several pens were clearly distinguishable based on their visible spectra alone, others exhibited overlap. Linear discriminant analysis was then used to build a chemometric model for the classification of the inks. Using a separate validation set, 71.7% of spectra were correctly assigned to a specific pen, and a further 16.7% to the correct pen supplier. Analysis of six pen inks stored under different conditions found the inks remained chemically stable for at least two months when stored in the dark. However, two inks exhibited spectral changes within one week under ambient light, and all but one ink displayed changes within two months, resulting in altered predictions using the chemometric model. This may be useful in cases of alleged fraud, where it is suspected that an ink entry may have been altered using the same pen at a later date. Artificial ageing experiments found that both heat and ultraviolet light play a role in the ageing process, and that accelerated ageing using these factors gives a reasonable depiction of short-term ageing under natural conditions.

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