Chemical composition effect on latent print development using black fingerprint powders

Moreno, Sara; Brown, Glenna; Klein, Mieke; Wang, Qiang; Alemán, Elvin A.; Rushton, Catherine G.; Quiñones, Rosalynn

doi:10.1016/j.forc.2021.100366

Cited by 10 publications

(3 citation statements)

References 31 publications

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“…Composition – Six commercial black powders (i.e., Lightning black, Supranano black, Lynn Peavey, Evident, Sirchie 101L HiFi Volcano, Arrowhead) were characterized by various analytical techniques (i.e., XPS, SEM, EDS, DLS, ATR-IR, Raman spectroscopy, PXRD, and NMR) [ 331 ]. All powders were mostly composed of carbon and oxygen, with traces of other chemicals in varying quantities (e.g., sulphur, silicon, iron, aluminium).…”

Section: Fingermark Visualisationmentioning

confidence: 99%

Interpol review of fingermarks and other body impressions (2019 – 2022)

Bécue

Champod

2023

Forensic Science International: Synergy

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Section: Fingermark Visualisationmentioning

confidence: 99%

Interpol review of fingermarks and other body impressions (2019 – 2022)

Bécue

Champod

2023

Forensic Science International: Synergy

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“…It was not until 2010 when the potential of XPS analysis for forensics was publicly identified by Watts 16 . Since then, the technique has been used in multiple forensic fingerprint studies, 17–20 but was not yet applied in forensic analysis of inks until recently as part of a round‐robin study 10 . Out of 18 methods in that study, XPS and LIBS were the only ones able to spectrally discriminate between the three inks in the sample set.…”

Section: Introductionmentioning

confidence: 99%

Deposition order and physicochemical process visualization of ink intersections using X‐ray photoelectron spectroscopy imaging for forensic analysis

Sullivan,

Pinson,

Eberhardt

et al. 2023

Surface & Interface Analysis

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The physicochemical events at ink intersections are largely understudied. Chemical imaging techniques and multivariate analyses applied to this problem thus far lack the performance characteristics to make confident conclusions about these processes. This deficiency leads to subjective and controversial deposition order determinations in forensic investigations. In this comprehensive report, 44 unique crossings involving laser toners and stamps, as well as felt‐tip, rollerball, gel, and ballpoint pen inks, were imaged with X‐ray photoelectron spectroscopy (XPS), using a 50‐μm X‐ray spot size and 100‐μm steps. The specificity and surface sensitivity of XPS enabled the objective visualization of the inks' chemistry upon deposition via spatial elemental distribution in‐situ. Signal intensity and atomic concentration were mapped for each element detected. Discrimination was possible in 100% of written and printed inks analyzed, and the relationship between the elemental concentration profile in each intersection was compared with the known sequence. Formation of ink layers, mixing, and separation of ink components by way of electrostatic forces were observed. Insights into the known complexity of ink intersection processes were revealed and highlight the need for understanding the chosen analytical technique's information depth and for complementary analyses to increase sequencing confidence. We also provide evidence that these processes invalidate the utility of principal component analysis for analyzing ink intersections. However, sequencing accuracy was 84% for all samples analyzed, and its success was highly dependent on the presence of physical features (i.e., thick coatings and embossed regions). In some intersection types, especially toners, the features exposed with XPS imaging enabled a sequencing accuracy of 100%.

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“…The characteristics of the FPs powders were a significant component impacting the method’s success. Traditional methods, such as metallic powders and magnetic powders have limitations, such as low background interference, poor selective interactions with the FP deposits, and offer significant health risks for users 37 , 38 . As a result, the development of innovative and high-efficiency FP powders for sensitive LFPs visualization was critical.…”

Section: Introductionmentioning

confidence: 99%

One material, many possibilities via enrichment of luminescence in La2Zr2O7:Tb3+ nanophosphors for forensic stimuli aided applications

Lavanya

Darshan

Malleshappa

et al. 2022

Sci Rep

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Engineering a single material with multidirectional applications is crucial for improving productivity, low cost, flexibility, least power consumption, etc. To achieve these requirements, novel design structures and high-performance materials are in urgent need. Lanthanide-doped nanophosphors have the greatest strengths and ability in order to tune their applications in various dimensions. However, applications of nanophosphor in latent fingerprints visualization, anti-counterfeiting, and luminescent gels/films are still in their infancy. This study demonstrated a simple strategy to enhance the luminescence of Tb3+ (1–11 mol %) doped La2Zr2O7 nanophosphors by conjugating various fluxes via a simple solution combustion route. The photoluminescence emission spectra reveal intense peaks at ~ 491, 546, 587, and 622 nm, which arises from 5D4 → 7FJ (J = 6, 5, 4, 3) transitions of Tb3+ ions, respectively. The highest emission intensity was achieved in the NH4Cl flux assisted nanophosphor as compared to NaBr and NH4F assisted samples. The colorimetric images of fingerprints visualized using the optimized nanophosphor on forensic related surfaces exhibit level –III ridge details, including sweat pores, the width of the ridges, bifurcation angle, and the successive distance between sweat pores, etc. These results are decisive parameters that clearly support the statement “no two persons have ever been found to have the same fingerprints”. The anti-counterfeiting security ink was formulated using optimized nanophosphor and various patterns were designed by simple screen printing and dip pen technologies. The encoded information was decrypted only under ultraviolet 254 nm light. All the designed patterns are exhibit not just what it looks/feel like and how better it works. As a synergetic contribution of enhanced luminescence of the prepared nanophosphor, the green-emissive films were fabricated, which display excellent flexibility, uniformity, and transparency in the normal and ultraviolet 254 nm light illumination. The aforementioned results revealed that the prepared NH4Cl flux-assisted La2Zr2O7: Tb3+(7 mol %) NPs are considered to be the best candidate for multi-dimensional applications.

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Chemical composition effect on latent print development using black fingerprint powders

Cited by 10 publications

References 31 publications

Interpol review of fingermarks and other body impressions (2019 – 2022)

Interpol review of fingermarks and other body impressions (2019 – 2022)

Deposition order and physicochemical process visualization of ink intersections using X‐ray photoelectron spectroscopy imaging for forensic analysis

One material, many possibilities via enrichment of luminescence in La2Zr2O7:Tb3+ nanophosphors for forensic stimuli aided applications

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