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Differentiating Writing Inks Using Direct Analysis in Real Time Mass Spectrometry
Journal of Forensic Sciences
  • Roger W. Jones, Iowa State University
  • Robert B. Cody, JEOL USA Inc.
  • John Frederick McClelland, Iowa State University
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Writing ink analysis is used in establishing document authenticity and the sources and relative ages of written entries. Most analytical methods require removing samples or visibly altering the document. Nondestructive, in situ analysis of writing inks on paper without visible alteration is possible using mass spectrometry with a new ion source called Direct Analysis in Real Time. Forty-three different black and blue ballpoint, black fluid, and black gel inks were examined. Both dyes and persistent but thermally labile components of the inks contribute to the mass spectra, principally as protonated molecules [M1H]1. Numerous ink components were identified from the spectra. The spectra were placed in a searchable library, which was then challenged with two spectra from each of the 43 inks. The best match for each of the challenge spectra was correct for all but one ink, which matched with a very similar ink by the same manufacturer.

This is the peer reviewed version of the following article: Journal of Forensic Science 54 (2006): 915, which has been published in final form at This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for self-archiving.

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Roger W. Jones, et al
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Citation Information
Roger W. Jones, Robert B. Cody and John Frederick McClelland. "Differentiating Writing Inks Using Direct Analysis in Real Time Mass Spectrometry" Journal of Forensic Sciences Vol. 51 Iss. 4 (2006) p. 915 - 918
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