Development of latent fingermarks by aqueous electrolytes

Jasuja, Om Prakash; Singh, Gagandeep; Almog, Joseph

doi:10.1016/j.forsciint.2010.10.011

Cited by 25 publications

(35 citation statements)

References 13 publications

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“…Jasuja et al [11] used aqueous electrolytes (primarily acid and base solutions) to enhance fingermarks on metals and concluded that secretions act as a barrier for reaction with the metal. As with differential oxidation, the technique is dependent on the reaction with the substrate, not with the deposit and the deposit is acting as an inhibiting barrier.…”

Section: Introductionmentioning

confidence: 99%

The interaction of fingermark deposits on metal surfaces and potential ways for visualisation

Wightman

Emery

Austin

et al. 2015

Forensic Science International

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The interaction of fingermark deposits on metals has been examined by a variety of techniques. Visualisation by film growth has been the main area of investigation through: thermal oxidation, anodising, peroxide solution, and the interaction with vapour of iodine and ammonium sulphide. Corrosion of the underlying metal has also been examined as an alternative means of visualisation. Confocal microscopy was used to look at the film thickness and corrosion products around the prints. Scanning electron microscopy and energy dispersion of X-rays (SEM-EDX) examined a number of metal samples to investigate film growth and the elemental distribution. The observations suggest that differential oxidation was occurring as well as corrosion into the metal. Fingermark deposits on metals can corrode into the metal depending on the reactivity of the metal and leave a recoverable mark. However, fingermark deposits can also alter the rate of chemical reaction of the substrate metal by oxidation. In some cases organic matter can inhibit reaction, both when forming an oxide layer and when corroding the metal. However, signs of third level detail from pore contact may also be visible and the monovalent ions from salts could also influence film growth. Whilst further work would need to be carried out to decide whether any of these techniques may have application in fingermark recovery, this study does suggest that fingermarks on metals may be recoverable after incidents such as fires or immersion in water.

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Section: Introductionmentioning

confidence: 99%

The interaction of fingermark deposits on metal surfaces and potential ways for visualisation

Wightman

Emery

Austin

et al. 2015

Forensic Science International

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“…Liu et al also suggests that the longer a fingermark is deposited on a case, the better its visualization will be due to the greater corrosion time allowed. In this study, the immersion time of the cases was 24 h, which is significantly longer than that reported by Jasuja et al (10–180 min) and could have played a role in the quality of the fingermarks that were developed. According to IFRG guidelines, the studies examined here can be considered as phase 2, although a higher phase seems within reach since fired cartridge cases were also examined.…”

Section: Chemical Methodsmentioning

confidence: 51%

Detection of Fingermarks—Applicability to Metallic Surfaces: A Literature Review

Christofidis

Morrissey

Birkett

2018

Journal of Forensic Sciences

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There are many different fingermark visualization techniques available, and the choice of methodology employed may be dependent on the surface type. This comprehensive review of the scientific literature evaluates the methodologies of fingermark enhancement methods that are applicable to metallic surfaces; optical, physical, chemical, and physicochemical methods are critically discussed. Methods that are currently used and those that have the potential to reduce the cost and time required to process evidence and increase the recovery rates are considered and are assessed against the Centre for Applied Science and Technology (CAST) and the International Fingerprint Research Group (IFRG) guidelines. The use of chemical imaging techniques in particular has increased the potential to recover fingermarks of sufficient quality for identification purposes. Presently, there appears to be a lack of detailed research pertaining to validation and thorough casework studies for fingermark enhancement techniques. Further studies incorporating these guidelines are recommended.KEYWORDS: forensic science, fingermarks, fingerprints, enhancement techniques, metallic surfaces, latent fingermarks Fingermarks are considered one of the most valuable types of physical evidence recovered from a crime scene. Fingermark casework is still the most common casework for forensic scientists despite the increase in use of DNA (1) to identify/exonerate suspects via bodily fluids (2). The ridge patterns found in fingermarks are permanent and can be used to individualize or exclude suspects from an investigation.Detection of fingermarks on metallic surfaces will be dependent upon the compounds remaining from the fingermark residue. Several detailed reviews have already been published on fingermark composition, but none have focused on fingermarks deposited on metallic surfaces (3,4).Generally, there are two types of fingermarks found at crime scenes: visible fingermarks, usually formed by fingers contaminated by a substance such as oil, fruit, grease, paint or blood, which are deposited on a surface; and latent fingermarks, which are invisible to the naked eye and are the most abundant type of fingermarks at crime scenes. Metallic surfaces are also commonly encountered in crime scenes and are ubiquitous in the environment. Surfaces such as the door of a car, objects like handles, weapons, and tools are usually made of steel. Cartridge cases are frequently recovered from crime scenes and are usually made of brass or nickel (5). There are a number of different techniques that can be applied to a surface to visualize latent fingermarks. The selection of a suitable technique depends on different factors, such as the expected composition of a fingermark, the ability of the chosen technique to be used in tandem with other techniques, and the nature of the substrate. In this review, the focus will be on fingermarks deposited on metallic surfaces, and the optical, physical, chemical, and physicochemical visualization techniques that can be used ...

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“…These approaches contain destructive developments (aqueous electrolyte immersion [8] and fluorescence [9]) and non-destructive developments (optical reflection [10], metal sputtering [11], scanning Kelvin probe [12,13], infrared spectroscopic imaging [14], electrochemistry [6,[15][16][17][18][19][20][21]). The destructive developments are helpful for high contrast visualization of LFMs but not recommended because they would disturb the subsequent DNA analysis by decomposing DNA under the circumstance of UV light or highly acidic/alkaline electrolyte.…”

Section: Introductionmentioning

confidence: 99%

Latent Fingermarks Enhancement in Deep Eutectic Solvent by Co-electrodepositing Silver and Copper Particles on Metallic Substrates

Zhang

Wei

et al. 2016

Electrochimica Acta

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Development of latent fingermarks by aqueous electrolytes

Cited by 25 publications

References 13 publications

The interaction of fingermark deposits on metal surfaces and potential ways for visualisation

The interaction of fingermark deposits on metal surfaces and potential ways for visualisation

Detection of Fingermarks—Applicability to Metallic Surfaces: A Literature Review

Latent Fingermarks Enhancement in Deep Eutectic Solvent by Co-electrodepositing Silver and Copper Particles on Metallic Substrates

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