Vacuum metal deposition: developing latent fingerprints on polyethylene substrates after the deposition of excess gold

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

doi:10.1016/s0379-0738(01)00507-2

Cited by 36 publications

(31 citation statements)

References 3 publications

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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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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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“…Currently, this technique is applied for visualized latent fingerprints as known as Vacuum Metal Deposition (VMD) [1][2][3][4]. For example, gold was deposited on polyethylene substrates to develop fingerprints [5], copper and gold can deposit on the polymer banknotes to visualize latent fingerprints [6] and gold/Zinc VMD was also successful to visualized the fingerprints on fabrics [7]. Moreover, the organic chemicals were also succeeded to develop latent fingerprints instead of metals e.g.…”

Section: Introductionmentioning

confidence: 99%

Vacuum Vaporization Technique for Latent Fingerprints Development on Thermal Papers using Lawsone Natural Products

Phungyimnoi

Eksinitkun

Phutdhawong

2017

J. Phys.: Conf. Ser.

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Abstract. The vacuum vaporization technique is widely used to develop of visualized latent fingerprints on substrate surface for forensics investigation. In this study, we reported the first utilization of lawsone in the vacuum vaporization technique. The lawsone was sublimation in vacuum and showed the detected latent fingerprints on thermal papers. The method involves hanging the thermal paper samples 5, 10, 15 cm above a heating source with dispersed lawsone solids in a vacuum chamber. The optimized condition for lawsone sublimation are 50, 100, 150 mg with low-vacuum (0.1 mbar) and vaporizing temperature at 40-60°C. The sample fingerprints were left for 1, 3, 7 and 30 days before examination comparison between lawsone and fingerprint ink pad using an Automated Fingerprint Identification (AFIS). The resulted showed that using 100 mg lawsone sublimation on thermal paper at the range of 10 cm evidenced the clear, detectable minutiae which can be used for visualization and identification of latent prints without the background black staining known. Thus, this study might be interested application for developing latent fingerprints as a solvent free technique and non-hazardous materials. IntroductionThe vacuum vaporization is a technique of thin-film deposition in which the metals were brought into the gas phase by thermal sublimation and deposited to the surface of substrate for a thin film. This process is widely used in the semiconductor, microelectronic and optical industries. Currently, this technique is applied for visualized latent fingerprints as known as Vacuum Metal Deposition (VMD) [1][2][3][4]. For example, gold was deposited on polyethylene substrates to develop fingerprints [5], copper and gold can deposit on the polymer banknotes to visualize latent fingerprints [6] and gold/Zinc VMD was also successful to visualized the fingerprints on fabrics [7]. Moreover, the organic chemicals were also succeeded to develop latent fingerprints instead of metals e.g. the use of solid ninhydrin used develop the latent fingerprints on porous surface [8]. Thus, the organic chemicals that can undergo thermal sublimation and visualization are of interest to study for the vacuum vaporization. Lawsone is a naphthoquinone natural products from the leaves of Lawsonia inermis has been used as a skin and hair dye as its reacts with amino acids of keratin. The lawsone solution can also react with latent fingerprint deposits on paper surfaces to show purple-brown impressions of ridge details which are also photo luminescent [9]. Detection of latent fingerprints on thermal paper is an

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“…Optimum amount of Au for Au/Zn VMD varied with different plastics [6][7][8]. A thickness monitor has usually been required to control the deposition of extremely small amount of Au for Au/Zn VMD [5][6][7][8]. On the other hand, amount of zinc required to develop fingerprints in VMD has been determined until the fingerprints were seen.…”

Section: Introductionmentioning

confidence: 99%

“…utilized to develop latent fingerprint in Au/Zn VMD, the resultant Zn deposit was partially oxidized to ZnO x either after exposure to air or during Zn deposition in the presence of oxygen [6]. Meanwhile, continuous ZnO films deposited by vacuum evaporation techniques have been directly coated onto non-metallic materials for various applications [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Development of latent fingerprint by ZnO deposition

Jou

Chen

et al. 2011

Forensic Science International

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Vacuum metal deposition: developing latent fingerprints on polyethylene substrates after the deposition of excess gold

Cited by 36 publications

References 3 publications

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

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

Vacuum Vaporization Technique for Latent Fingerprints Development on Thermal Papers using Lawsone Natural Products

Development of latent fingerprint by ZnO deposition

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