Development of latent fingerprint by ZnO deposition

Yu, I-Heng; Jou, Shyankay; Chen, Chin-Min; Wang, Kuang-Chuan; Pang, Lei-Jang; Liao, Jeh Shane

doi:10.1016/j.forsciint.2010.07.035

Cited by 29 publications

(9 citation statements)

References 16 publications

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“…Due to the large surface inhomogeneity, we use the VMD technique to develop latent fingermarks. Recently, use of a ZnO coating was reported to be superior to Au/Zn deposition for the development of aged fingermarks on PET surfaces . We note that there would be similarities in the deposition and adhesion of zinc and zinc‐based compounds such as ZnO and ZnS on the gold coating due to the inherent chemistry involved.…”

mentioning

confidence: 88%

Enhanced Visualization of Latent Fingermarks on Rough Aluminum Surfaces Using Sequential Au and Zn/ZnS/ZnO Depositions

Tiwari

Alaoui

Guddala

et al. 2017

Journal of Forensic Sciences

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Detection and visualization of fingermarks on rough and diffuse surfaces is a relatively challenging task. We succeeded in developing latent fingermarks on scratched and rough aluminum surfaces by sequential deposition of a thin layer of gold followed by one of zinc or zinc-based compounds on the fingermarks. The best image enhancement was achieved with sequential Au and ZnS depositions. Using this combination, we could enhance the visualization of latent fingermarks aged over 65 days in normal conditions. The optical reflectance from the fingermarks with the deposited layers of metal/dielectric is analyzed as a stratified medium. Significant contrast in the reflectance from the regions of the ridges and the valleys of the fingermark would enhance the visualization. Our results show that the Au and ZnS bi-layer combination can have a large reflection contrast and improved fingermark visualization at wavelengths corresponding to the green light for specific thickness of ZnS.

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mentioning

confidence: 88%

Enhanced Visualization of Latent Fingermarks on Rough Aluminum Surfaces Using Sequential Au and Zn/ZnS/ZnO Depositions

Tiwari

Alaoui

Guddala

et al. 2017

Journal of Forensic Sciences

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“…Leuco dyes contain a lactone ring structure which forms color compounds in the presence of acidic components. The process of ring opening results in color formation, but this process is reversible that is why thermal paper fades with the passage of time (1969;Yoshida and Kitao 1989;Muthyala 1997). Thermal papers were improved by using iron soap and phenolic components which help in paint formation.…”

Section: Historical Development Of Thermal Papersmentioning

confidence: 99%

Development of fingerprints on thermal papers—a review

Yadav

2019

Egypt J Forensic Sci

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Background: In recent times, the use of thermal papers has increased exponentially and the fingerprints on thermal papers are frequently encountered. Although fingerprint development on paper has been standardized, that on thermal paper is complicated. Thermal papers turn black on the application of heat which poses a problem in the visualization of fingerprints which makes it difficult to visualize. Main body: One solution to this problem is to use heat or steam for the development of white fingerprints on darker backgrounds. Second solution might be to dissolve the chemicals present on the surface of the thermal papers using acetone. Many studies to develop fingerprints on thermal papers using iodine fuming, ninhydrin, 1,8diazofluorene-9-one, and p-dimethylaminocinnamaldehyde have been performed. In the present review, an attempt has been made to summarize the problem posed to fingerprint development on thermal papers and the probable solutions attempted by different authors. Conclusion: Although the development of fingerprints is difficult on thermal papers, it can be achieved either by subjecting the thermal paper to controlled heat or by removing the temperature-sensitive layer before treating it with other fingerprint development methods.

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“…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].…”

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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Development of latent fingerprint by ZnO deposition

Cited by 29 publications

References 16 publications

Enhanced Visualization of Latent Fingermarks on Rough Aluminum Surfaces Using Sequential Au and Zn/ZnS/ZnO Depositions

Enhanced Visualization of Latent Fingermarks on Rough Aluminum Surfaces Using Sequential Au and Zn/ZnS/ZnO Depositions

Development of fingerprints on thermal papers—a review

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

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