The influence of polymer type, print donor and age on the quality of fingerprints developed on plastic substrates using vacuum metal deposition

Jones, Naomi; Mansour, Danielle; Stoilovic, Milutin; Lennard, Chris; Roux, Claude

doi:10.1016/s0379-0738(01)00593-x

Cited by 71 publications

(69 citation statements)

References 3 publications

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“…This difference in optimal technique was found to be related to the paper chemical composition and surface free energy [7]. Other workers [9,10] have shown certain surfaces can give rise to reverse development of ridges and background when developed with VMD. Research groups also show latent print chemistry and development effectiveness is related to donor and time from deposition [11,12].…”

Section: Introductionmentioning

confidence: 96%

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Effect of substrate surface topography on forensic development of latent fingerprints with iron oxide powder suspension

Jones

Downham

Sears

2010

Surface & Interface Analysis

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Latent fingerprint deposition and effectiveness of detection are strongly affected by the surface on which prints are deposited. Material properties, surface roughness, morphology, chemistry and hydrophobicity can affect the usefulness or efficacy of forensic print development techniques. Established protocols outline appropriate techniques and sequences of processes for broad categories of operational surfaces. This work uses atomic force microscopy and scanning electron microscopy to investigate a series of surfaces classified as smooth, non-porous plastic. Latent prints developed with iron oxide powder suspension are analysed on a range of scales from macro to nano to help elucidate the interaction mechanisms between the latent fingerprint, development agent and underlying surface. Differences between surfaces have a strong effect, even within this single category. We show that both average roughness and topographical feature shape, characterized by skew, kurtosis and lay, are important factors to consider for the processing of latent fingerprints.The pre-peer review version of this article is included in the following pages. Please access the publisher's website for the definitive version Effect of Substrate Surface Topography on Forensic Development of Latent Fingerprints AbstractLatent fingerprint deposition and effectiveness of detection are strongly affected by the surface on which prints are deposited. Material properties, surface roughness, morphology, chemistry and hydrophobicity affect the usefulness or efficacy of forensic print development techniques such as dry powder, powder suspension, cyanoacrylate fuming or vacuum vapour deposition, and lack of development agent adhering to deposited print as well as excess background staining are both problematic. The deposited fingerprint is further affected by the contact conditions and the individual donor. Additional factors affect the detection algorithm such as pre-and post-deposition environment of the surface, humidity, contamination and cleaning agent or solvent spray.This work uses atomic force microscopy and scanning electron microscopy to investigate a series of surfaces and the interaction between latent fingerprint, surface and development agent. Latent prints developed with various techniques are analysed on a range of scales from macro-to nano-to help to elucidate the mechanisms of fingerprint development and aims to aid detection technique enhancement and algorithm improvement.

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Section: Introductionmentioning

confidence: 96%

“…Forensic casework and research laboratory studies show that latent fingerprint development efficiency can be affected by characteristics of the deposition surfaces as well as the donors [1][2][3][4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Effect of substrate surface topography on forensic development of latent fingerprints with iron oxide powder suspension

Jones

Downham

Sears

2010

Surface & Interface Analysis

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“…Further studies on fabric compared VMD and superglue fuming, which proved VMD to be more effective at developing fingermarks [14]. Despite the recent resurgence in VMD work and the price of VMD chambers dropping substantially over the last decade, very little has emerged recently comparing the efficiency of VMD in developing latent fingermarks on polymer banknotes, and other polymer substrates in general [15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Visualisation of latent fingermarks on polymer banknotes using copper vacuum metal deposition: A preliminary study

Davis

Kelly

King

et al. 2016

Forensic Science International

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The UK's recent move to polymer banknotes has seen some of the currently used fingermark enhancement techniques for currency potentially become redundant, due to the surface characteristics of the polymer substrates. Possessing a non-porous surface with some semi-porous properties, alternate processes are required for polymer banknotes. This preliminary investigation was conducted in to the recovery of fingermarks from polymer notes via vacuum metal deposition using elemental copper. The study successfully demonstrated that fresh latent fingermarks, from an individual donor, could be clearly developed and imaged in the near infrared. By varying the deposition thickness of the copper, the contrast between the fingermark minutiae and the substrate could be readily optimised. Where the deposition thickness was thin enough to be visually indistinguishable, forensic gelatin lifters could be used to lift the fingermarks. These lifts could then be treated with rubeanic acid to produce a visually distinguishable mark. The technique has shown enough promise that it could be effectively utilised on other semi-and non-porous substrates.

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“…Studies have shown that depth of penetration of fingermarks varies with types of paper, with a good correlation between penetration depth and quality of chemically developed prints [11][12][13][14][15]. Establishing the depth of penetration of prints into surfaces, as well as order of layers in, for instance, overprinting with text or images, can provide considerable assistance to crime-scene investigations by providing an insight into the history of documents for forensic studies.…”

Section: Introductionmentioning

confidence: 99%

Determining the order of deposition of natural latent fingerprints and laser printed ink using chemical mapping with secondary ion mass spectrometry

2013

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, "Determining the order of deposition of natural latent fingerprints and laser printed ink using chemical mapping with secondary ion mass spectrometry" Science and Justice 53 (2003) AbstractTime-of-flight secondary ion mass spectrometry (ToF-SIMS) chemical mapping was used to investigate the order of deposition of natural latent fingerprints and laser printed ink onpaper. This feasibility study shows that sodium, potassium and C 3 H 5 positive ions were particularly abundant endogenous components of the natural fingerprints and also present in the paper examined, but were mostly absent in the laser printed ink. Mapping of these ions enables the observation of friction ridges from latent prints on the ink surface, only when a fingerprint was deposited above the layer of ink. As a demonstration of proof of concept, blind testing of 21 samples from three donors resulted in a 100% success rate. The sensitivity of this technique was investigated within this trial through the examination of up to fifth depletion fingerprints and ageing of up to 28 days. Migration of fingerprint and paper components to the ink surface, although observed with increased ageing time, was not found to compromise determination of the deposition sequence.Keywords: Time-of-flight secondary ion mass spectrometry (ToF-SIMS); fingerprints; laser printing; paper; questioned documents; forensic science N Attard Montalto, JJ Ojeda and BJ Jones, "Determining the order of deposition of natural latent fingerprints and laser printed ink using chemical mapping with secondary ion mass spectrometry" Science and Justice 53 (2003) 2 This is an Archive Version. The definitive version is available at www.sciencedirect.com and via http://dx

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The influence of polymer type, print donor and age on the quality of fingerprints developed on plastic substrates using vacuum metal deposition

Cited by 71 publications

References 3 publications

Effect of substrate surface topography on forensic development of latent fingerprints with iron oxide powder suspension

Effect of substrate surface topography on forensic development of latent fingerprints with iron oxide powder suspension

Visualisation of latent fingermarks on polymer banknotes using copper vacuum metal deposition: A preliminary study

Determining the order of deposition of natural latent fingerprints and laser printed ink using chemical mapping with secondary ion mass spectrometry

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