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Issue 23, 2013
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The evidential value of microspectrophotometry measurements made for pen inks

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Abstract

Three colour systems, defined by the International Commission on Illumination (CIE), have been used to parametrise spectra from microspectrophotometry in the visible range for ten replicates of each of forty inks. The parametrised spectra were used to calculate a likelihood ratio (LR) for pairwise comparisons under the propositions implying that any ink from some suspect document came from the same pen, as that from a control document, versus, the converse proposition which implies the ink from the suspect document came from some other pen. Both univariate and bivariate likelihood ratios for each colour system were calculated. Empirical cross-entropy was selected as an appropriate measure of performance for each system. The bivariate combinations of the CIE-xyz colour system achieve the best results as well as a bivariate combination of a and b variables within the CIE-Lab colour system.

Graphical abstract: The evidential value of microspectrophotometry measurements made for pen inks

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Publication details

The article was received on 18 Sep 2013, accepted on 20 Sep 2013 and first published on 27 Sep 2013


Article type: Paper
DOI: 10.1039/C3AY41622D
Citation: Anal. Methods, 2013,5, 6788-6795
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    The evidential value of microspectrophotometry measurements made for pen inks

    A. Martyna, D. Lucy, G. Zadora, B. M. Trzcinska, D. Ramos and A. Parczewski, Anal. Methods, 2013, 5, 6788
    DOI: 10.1039/C3AY41622D

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