The effect of chlorine and hydrogen chloride on latent fingermark evidence

McDonald, Debbie; Pope, Hazel; Miskelly, Gordon M.

doi:10.1016/j.forsciint.2008.04.017

Cited by 12 publications

(8 citation statements)

References 16 publications

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“…Chlorine was produced by acidification of sodium hypochlorite solutions38 followed by washing with Millipore water to remove HCl 39. The three surface chemistry types (as‐etched, ozone‐oxidized, and furnace‐oxidized at 600 °C) were exposed to chlorine gas in an air‐tight vessel filled with laboratory air.…”

Section: Resultsmentioning

confidence: 99%

Internally Referenced Remote Sensors for HF and Cl₂ Using Reactive Porous Silicon Photonic Crystals

Ruminski

Barillaro

Chaffin³

et al. 2011

Adv Funct Materials

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Remote detection of reactive analytes using optical films constructed from electrochemically prepared porous Si‐based photonic crystals is demonstrated. Porous Si samples are prepared to contain either surface oxide or surface Si‐H species, and analyte detection is based on irreversible reactions with HF(aq) or Cl2(g) analytes, respectively. HF dissolves silicon oxide from the porous matrix, causing an irreversible blue‐shift in the resonance peak of the photonic crystal. Cl2 reacts with the native Si‐H species present on the surface of as‐etched porous Si to generate reactive silicon halides that evaporate from the surface and/or react with air to convert to silicon oxide. Either Cl2‐related process reduces the net refractive index of the material that is detected as a blue shift in the spectrum. With sufficient analyte concentrations or exposure times, the spectral blue shifts are visible to the unaided eye. A portion of the porous nanostructure is filled with inert polystyrene, which acts as an internal spectral reference. The polymer fiducial protects that portion of the sensor from attack by the corrosive analytes. Reflectance spectra from both the polymer‐filled and the unfilled, reactive porous layers are acquired simultaneously. The fiducial marker also allows elimination of artifacts associated with shifts of the resonance peak upon changing the angle of incidence of the optical probe. Theoretical angle‐resolved spectra (transfer matrix method) show a good match with the experimental data. High‐temperature air or room‐temperature ozone oxidation reactions are used to prepare the HF‐reactive surface, and it is found that the ozone oxidation reaction produces a greater sensitivity to HF (LLOD of 0.1% HF in water).

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Section: Resultsmentioning

confidence: 99%

Internally Referenced Remote Sensors for HF and Cl₂ Using Reactive Porous Silicon Photonic Crystals

Ruminski

Barillaro

Chaffin³

et al. 2011

Adv Funct Materials

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show abstract

“…In a separate investigation, iron oxide-based SPR was discovered to be less sensitive than molybdenum disulfide-based SPR, which was discovered to be more sensitive. (34). When iron oxide-based powder was utilized on a smooth plastic surface, there were some changes in how latent fingerprints were processed and how well developed the prints were.…”

Section: Assessment Of Spr Methodsmentioning

confidence: 99%

review on development of wet latent fingerprints by small particle reagent

Singh

2022

ijhs

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Small particle reagent technique is a method which is used to develop fingermarks on moist and smooth surfaces. It consist the theory of adherence of fine particles which is suspended in a treating solution to the oily or fatty components (water insoluble) present in in latent fingermark residue and gives a grey colored deposit. It is also considered as belonging to the family of powder dusting. The effectiveness of this technique can be increased by using fluorescent dyes in it's treating solution which can also detect faint fingermarks on multi-colored surfaces. Small particle reagent involves the use of synthetic detergent which was here replaced by saponin extracted from the fruit of Sapindus mukorossi as natural detergent. The other ingredient used in the formulation is black charcoal powder. This composition develops sharp and clear fingermarks on non-adsorbent surfaces like glass, metal sheet, plastic, laminated wood, ceramic tiles and compact discs after these were immersed in water for variable periods of time. The ability of the present formulation to detect weak chance prints not only enhances its utility, but also its potentiality in forensic investigations. The raw materials used to prepare the SPR are easily available and cost-effective.

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“…The author reported that among the three visualization methods, white SPR was deemed the best method to visualize wet latent fingerprints. In cases where ninhydrin and cyanoacrylate fuming failed to perform, McDonald et al (2008) recognized the potential of SPR in visualizing chlorine-exposed latent fingerprints at different levels of humidity (i.e., dry nitrogen, 60% and 100% of ambient humidity). In another study, Kumar et al (2014) claimed that SPR provided sufficiently clear and identifiable quality of visualized fingerprints on metallic knife immersed in water for up to 20 days, beyond which decreased quality of visualized fingerprints was observed.…”

Section: Developments Of Physical and Chemical Fingerprint Visualizinmentioning

confidence: 99%

Relevant visualization technologies for latent fingerprints on wet objects and its challenges: a review

Azman

Mahat

Wahab

et al. 2019

Egypt J Forensic Sci

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Fingerprint has been one of the powerful evidence in forensic investigation as it is useful for human identification, associating an individual to an item and/or location of interest, as well as reconstructing the crime scenes. Considering that latent fingerprints are commonly found at crime scenes and that it requires the use of fingerprint visualization methods due to its hidden nature, continuous research in developing suitable methods has been reported. However, the underlying physical and/or chemical interactions for certain visualization methods that have successfully visualized wet fingerprints remains unreported. This is probably because previous studies were primarily focused on establishing the fingerprint contrast rather than the comprehension of the physical and chemical aspects behind it. A good understanding on such aspects may prove useful in guiding future improvements, or modifications of existing fingerprint visualization methods. Hence, this review paper focuses on wet latent fingerprints, difficulties in the available wet fingerprint visualization methods, as well as its overview of the challenges and future insights.

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The effect of chlorine and hydrogen chloride on latent fingermark evidence

Cited by 12 publications

References 16 publications

Internally Referenced Remote Sensors for HF and Cl₂ Using Reactive Porous Silicon Photonic Crystals

Internally Referenced Remote Sensors for HF and Cl₂ Using Reactive Porous Silicon Photonic Crystals

review on development of wet latent fingerprints by small particle reagent

Relevant visualization technologies for latent fingerprints on wet objects and its challenges: a review

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The effect of chlorine and hydrogen chloride on latent fingermark evidence

Cited by 12 publications

References 16 publications

Internally Referenced Remote Sensors for HF and Cl2 Using Reactive Porous Silicon Photonic Crystals

Internally Referenced Remote Sensors for HF and Cl2 Using Reactive Porous Silicon Photonic Crystals

review on development of wet latent fingerprints by small particle reagent

Relevant visualization technologies for latent fingerprints on wet objects and its challenges: a review

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Product

Resources

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Internally Referenced Remote Sensors for HF and Cl₂ Using Reactive Porous Silicon Photonic Crystals

Internally Referenced Remote Sensors for HF and Cl₂ Using Reactive Porous Silicon Photonic Crystals