Composition and properties of fingermarks

Croxton, Ruth; Bleay, Stephen M.; Puit, Marcel de

doi:10.1002/9781119187400.ch3

Cited by 7 publications

(2 citation statements)

References 101 publications

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“…This is approximately 15 % on mint notes and 20 % on handled notes. This difference is likely due to a range of factors which includes: differences in banknote material or structure with issue date, donor secretion composition [29,31], duration and environmental differences such as humidity during storage, variation in the VMD operator and differences in the grader of developed marks [32]. The trends are the same in both studies, with VMD effective on mint and handled banknotes.…”

Section: Comparison Of Studiesmentioning

confidence: 88%

Degradation of polymer banknotes through handling, and effect on fingermark visualisation

et al. 2022

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Section: Comparison Of Studiesmentioning

confidence: 88%

Degradation of polymer banknotes through handling, and effect on fingermark visualisation

et al. 2022

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“…Mass spectrometry imaging techniques, including timeof-flight secondary ion mass spectrometry (ToF-SIMS) and matrix-assisted laser desorption ionisation mass spectrometry imaging (MALDI-MSI), allow molecules in the uppermost 2 of 12 surface layers of a sample to be mapped based on their mass to charge ratio (m/z). The distribution of molecules across the surface can yield an image of fingerprint ridge detail where the composition differs between the residue and the background surface [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Expanding the Efficacy of Fingermark Enhancement Using ToF-SIMS

et al. 2023

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Time-of-flight secondary ion mass spectrometry (ToF-SIMS) has been shown to enhance fingermark recovery compared to standard processes used by police forces, but there is no data to show how generally applicable the improvement is. Additionally, ToF-SIMS can be run in either positive or negative ion mode (or both), and there is no data on which mode of operation is most effective at revealing fingerprints. This study aims to fill these gaps by using ToF-SIMS to image fingerprints deposited on two common exhibit-type surfaces (polyethylene and stainless steel) using 10 donors and ageing fingerprints in either ambient, rainwater, or underground for 1 and 5 months. In all, 120 fingerprints were imaged using ToF-SIMS, and each was run in positive and negative modes. A fingerprint expert compared the fingerprint ridge detail produced by the standard process to the ToF-SIMS images. In over 50% of the samples, ToF-SIMS was shown to improve fingerprint ridge detail visualised by the respective standard process for all surfaces tested. In over 90% of the samples, the ridge detail produced by ToF-SIMS was equivalent to standard development across all different ageing and exposure conditions. The data shows that there is a benefit to running the ToF-SIMS in both positive and negative modes, even if no ridge detail was seen in one mode.

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