Fingerprint Development Techniques

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

doi:10.1002/9781119187400

Cited by 54 publications

(93 citation statements)

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“…The first step of the mechanism is initiated by an anionic nucleophile attacking the double bond on a cyanoacrylate, producing a monomeric intermediate labeled as I in Figure . This first step is generally agreed upon in literature . Nucleophilic attack of this monomer to another acrylate would result in the formation of dimeric intermediate labeled as II.…”

Section: Resultssupporting

confidence: 59%

Study of the cyanoacrylate fuming mechanism by matrix‐assisted laser desorption/ionization mass spectrometry

O'Neill

Lee

2019

J Mass Spectrom

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Despite cyanoacrylate fuming being widely used in the forensic science field, its mechanism is not well understood. In this study, matrix-assisted laser desorption/ionization (MALDI) mass spectrometry is used to study latent fingerprints that have been cyanoacrylate fumed in an attempt to gain insight into the fuming mechanism. In the negative mode mass spectrometry data, four compounds related to the polymerization of cyanoacrylate are identified and their structures are determined from accurate mass and MS/MS. A mechanism is proposed for the formation of these compounds that are regarded as intermediates in the polymerization reaction. In addition, based on the fuming of standard endogenous compounds, we suggest that fatty acids and amino acids are the major catalytic nucleophiles that initiate the polymerization reactions.

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Section: Resultssupporting

confidence: 59%

Study of the cyanoacrylate fuming mechanism by matrix‐assisted laser desorption/ionization mass spectrometry

O'Neill

Lee

2019

J Mass Spectrom

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“…(3) on uncirculated polymer banknotes referred also to the use of long‐wave UV (LWUV) after CA fuming as a possible part of the sequence. However, the LWUV, which is often recommended over the shorter 254 nm UV (SWUV) due to health and safety issues, may, in many cases, be less effective in overcoming the background interference (18). Although there may be a potential detrimental effect of SWUV on DNA recovery, this is not the case in our operative latent fingerprint laboratory as well as in many other agencies around the world as the work flow involves DNA examinations prior to development processes.…”

Section: Figmentioning

confidence: 99%

Time is Money or Money is Time? A Rapid Operational Sequence for Detecting Fingermarks on Polymer Banknotes

Bengiat

Liptz

Rajs

et al. 2020

Journal of Forensic Sciences

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Banknotes are often found in high‐profile crimes such as armed robberies, bribery, and terrorist activity. However, such exhibits present a challenge to forensic operatives regarding fingermarks development, due to their mass quantities, potential for fingermarks on both sides, and their unique complex background in terms of color, irregular patterns, and topography. Hence, the standard development protocols become inefficient, due to the difficulty in achieving high contrast images over the background. This study focused on finding an operational sequence that would minimize the time of work on polymer banknotes, in terms of both development and image processing. Thirty‐two fingermarks were developed by vacuum metal deposition (VMD), black magnetic powder, and cyanoacrylate fuming (CA) followed by visualization and imaging by reflected short‐wave UV (RUVIS) (96 in total), showing a distinct advantage to the CA and RUVIS imaging over the other two techniques with a 75% success rate in the dark and high background regions, due to its physical principle which neutralizes high background interference. The images were then scanned by the automatic fingerprint identification system (AFIS) to test its ability to correctly differentiate false background features from real ones, again, showing a superiority of the RUVIS with 63% of the total initial marked features, being real. Overall, the CA and RUVIS sequence was found to be an ultimate method for multiple, same‐type surfaces, with the RUVIS capable of visualization and capturing of the images simultaneously, significantly reducing the time of development and image processing.

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“…There are a range of fluorogenic fingermark reagents recommended for use, many of which can be found in the Fingermark Visualisation Manual [1]. 1,8-Diazafluoren-9-one (DFO) is a widely used Category A process that reacts with the amine group of amino acids, that are present within the fingerprint deposit itself, to yield a fluorescent product which fluoresces orange under green light excitation, with an excitation maxima at approximately 555 nm [14]. Other fluorescent processes work in a similar manner and require fluorescent screening, using appropriate light sources, in a darkened environment.…”

Section: Introductionmentioning

confidence: 99%

The importance of dark adaptation for forensic examinations; an evaluation of the Crime-lite Eye™

et al. 2019

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Forensic practitioners are recommended to dark adapt their eyes prior to conducting evidential searches in the dark. The dark adaptation process remains poorly standardised across the discipline, with little quantified regarding the benefits of such preparative steps. Herein, we report the findings of a study that recruited 50 participants to assess the effectiveness of the Crime-lite Eye™, a darkness adaptation device developed to assist forensic practitioners both in the laboratory and in field. Participants were tasked with searching for the fluorescent signatures left by reaction of 1,8-diazafluoren-9-one (DFO) with amino acids, in a manner akin to the fluorogenic fingerprint treatment of porous evidence. Using an Epson Stylus Photo R265 inkjet printer, ink cartridges were filled with alanine solutions of various concentrations, allowing different motifs to be printed onto copy paper and subsequently developed using DFO. Participants searched for this 'evidence' both with and without dark adapted vision. On average, participants were able to locate and correctly recognise 16 % more evidence once dark adapted using the Crime-lite Eye™. The increase in evidence located by participants once dark adapted suggests that crime scene officers should be dark adapting in order to visualise as much as possible. The time taken to dark adapt, 10 minutes on average during this study, is not excessively long, and should not significantly slow the investigation.

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Fingerprint Development Techniques

Cited by 54 publications

References 0 publications

Study of the cyanoacrylate fuming mechanism by matrix‐assisted laser desorption/ionization mass spectrometry

Study of the cyanoacrylate fuming mechanism by matrix‐assisted laser desorption/ionization mass spectrometry

Time is Money or Money is Time? A Rapid Operational Sequence for Detecting Fingermarks on Polymer Banknotes

The importance of dark adaptation for forensic examinations; an evaluation of the Crime-lite Eye™

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