A comparison of visible wavelength reflectance hyperspectral imaging and Acid Black 1 for the detection and identification of blood stained fingerprints

Cadd, Samuel; Li, Bo; Beveridge, Peter; O’Hare, W. T.; Islam, Meez

doi:10.1016/j.scijus.2015.12.007

Cited by 16 publications

(13 citation statements)

References 21 publications

(35 reference statements)

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“…The dye then selectively stains the proteins, and excess unbound dye molecules are removed with a wash solution. These dyes are all sensitive to faint traces of blood because there are many proteins present, however they have limitations in that they are not specific to blood and can give false positive reactions with a wide range of other protein‐containing substances (Cadd et al, 2016).…”

Section: Utilization Of Fingermark Chemistry In Mark Enhancementmentioning

confidence: 99%

The forensic exploitation of fingermark chemistry: A review

Bleay

Bailey

Croxton

et al. 2020

WIREs Forensic Science

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The substances deposited from the fingertip onto a surface during contact between them represent a highly complex range of chemicals that can be exploited in a variety of ways in a forensic investigation. An overview is given of the multitude of chemicals that have been detected in fingermarks, including those occurring in endogenous sweat, metabolites of ingested substances, and exogenous substances picked up on the fingertip. Changes in chemistry that may occur between deposition of the fingermark and its subsequent forensic analysis are discussed, with particular reference to the ways in which these changes have been considered as a means of dating fingermarks. The ways in which fingermark enhancement reagents utilize the different chemicals present to reveal ridge is reviewed, together with how different classes of chemical can be sequentially targeted to optimize the number of fingermarks recovered.A field of increasing interest is the use of advanced analytical techniques incorporating mass spectrometry and imaging capability to simultaneously obtain additional contextual information about the donor of the mark while visualizing the fingermark ridge pattern. Examples are given of how such information can be applied in forensic investigations. It is concluded that an extensive "tool kit" of fingermark enhancement processes is already available to utilize the different chemicals present, and the advances that can be made in this field using conventional approaches are limited. There is, instead, significant potential to utilize analytical techniques to forensically exploit the chemical information within fingermarks but there are also significant barriers to their implementation in this way.

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Section: Utilization Of Fingermark Chemistry In Mark Enhancementmentioning

confidence: 99%

The forensic exploitation of fingermark chemistry: A review

Bleay

Bailey

Croxton

et al. 2020

WIREs Forensic Science

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show abstract

“…This was chosen because it can be used by a wide range of users, including crime scene investigators. The previous HSI setups, such as the one used by Cadd et al [1,3,4], were prototype, non‐portable laboratory‐based instruments that required custom software and an expert user to be able to operate it. The system consists of a front lens, an imaging spectrograph, and an image sensor.…”

Section: Methodsmentioning

confidence: 99%

“…Blood is one of the most commonly found types of evidence that is encountered at violent crime scenes [1][2][3][4]. One of the first challenges that examiners face is to determine if a substance is blood before performing further analyses.…”

mentioning

confidence: 99%

A comparison between visible wavelength hyperspectral imaging and digital photography for the detection and identification of bloodstained footwear marks

Crowther

Thompson

et al. 2021

Journal of Forensic Sciences

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One of the first challenges that crime scene examiners have is determining if a substance is blood before performing analysis. Conventional methods of detecting blood involve the use of chemicals and different wavelengths of light in tandem with digital photography. However, these methods are destructive or provide false positives.Visible wavelength hyperspectral imaging (HSI) is a noncontact blood detection method that has been proven to provide accurate and reliable results. A novel application of this technique has been used for the detection and positive identification of bloodstained footwear marks, of different dilutions ranging from undiluted to 1:50 with distilled water, and on a range of substrates, and colors. Comparisons between HSI and conventional digital photography were made using a grading scale and analyzed using Mann-Whitney U-tests. The HSI technique was able to detect a statistically significant greater amount of tread detail on white tiles, laminate, carpet, and blue tiles compared with the digital photography technique, which was only superior on black tiles. Critically, the HSI technique was also able to determine that the footwear marks were made in blood.These results show that HSI will be useful in forensic investigations, where it is known that the perpetrator has walked through the victim's blood and left a trail of footwear marks at the crime scene. Even if the perpetrator had time to clean up afterward resulting in diluted stains, HSI would still be able to detect bloodstained footwear marks with a greater amount of detail compared with digital photography.

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“…Cadd et al used the same criteria of correlation coefficient with the soret band for the identification of blooded fingerprints on white tiles [ 29 ] and different colored tiles [ 30 ] in their future studies. Cadd et al extended the work with a chemical enhancement of Acid Black 1 for the first time to detect blood-stained fingerprint [ 31 ]. In all of the above, temperature and humidity must be maintained to avoid blue spectral shift [ 32 ].…”

Section: Introductionmentioning

confidence: 99%

Hyperspectral Imaging for Bloodstain Identification

Zulfiqar

Ahmad

Sohaib

et al. 2021

Sensors

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Blood is key evidence to reconstruct crime scenes in forensic sciences. Blood identification can help to confirm a suspect, and for that reason, several chemical methods are used to reconstruct the crime scene however, these methods can affect subsequent DNA analysis. Therefore, this study presents a non-destructive method for bloodstain identification using Hyperspectral Imaging (HSI, 397–1000 nm range). The proposed method is based on the visualization of heme-components bands in the 500–700 nm spectral range. For experimental and validation purposes, a total of 225 blood (different donors) and non-blood (protein-based ketchup, rust acrylic paint, red acrylic paint, brown acrylic paint, red nail polish, rust nail polish, fake blood, and red ink) samples (HSI cubes, each cube is of size 1000 × 512 × 224, in which 1000 × 512 are the spatial dimensions and 224 spectral bands) were deposited on three substrates (white cotton fabric, white tile, and PVC wall sheet). The samples are imaged for up to three days to include aging. Savitzky Golay filtering has been used to highlight the subtle bands of all samples, particularly the aged ones. Based on the derivative spectrum, important spectral bands were selected to train five different classifiers (SVM, ANN, KNN, Random Forest, and Decision Tree). The comparative analysis reveals that the proposed method outperformed several state-of-the-art methods.

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A comparison of visible wavelength reflectance hyperspectral imaging and Acid Black 1 for the detection and identification of blood stained fingerprints

Cited by 16 publications

References 21 publications

The forensic exploitation of fingermark chemistry: A review

The forensic exploitation of fingermark chemistry: A review

A comparison between visible wavelength hyperspectral imaging and digital photography for the detection and identification of bloodstained footwear marks

Hyperspectral Imaging for Bloodstain Identification

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