Fingermarks in blood: Mechanical models and the color of ridges

Geller, Boris; Leifer, Amihud; Attias, David; Mark, Yanku

doi:10.1016/j.forsciint.2018.03.008

Cited by 8 publications

(5 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The latter is called "inverted ridge". 52 The reason for formation of the inverted ridge will be discussed later. Satisfactorily, both types enable the recognition of the whole pattern and details, for identifying personal information.…”

Section: Resultsmentioning

confidence: 97%

See 1 more Smart Citation

Highly Stable, Nondestructive, and Simple Visualization of Latent Blood Fingerprints Based on Covalent Bonding Between the Fluorescent Conjugated Polymer and Proteins in Blood

Fan

Zhang

Chen

et al. 2021

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Latent blood fingerprints (LBFPs) can provide critical information of foul play and help identify the suspects at violent crime scenes. The current methods for LBFP visualization are still not satisfactory because of the low sensitivity or complicated protocol. This study demonstrates a simple and effective LBFP visualization strategy by integrating a new amphiphilic fluorescent amino-functionalized conjugated polymer with the cotton-pad developing protocol. LBFPs on various substrates are visualized by simply covering them with the polymer solution-soaked cotton pads. The images display clear fingerprint patterns, ridge details, and sweat pores, even on very challenging substrates such as painted wood and multicolored can. The gray value analysis confirms semiquantitatively the enhancement of the contrast between ridges and furrows. Even LBFPs with various contaminations or aged for more than 600 days are effectively developed and visualized. The developed fingerprint images show superior stability over long storage time and against solvent washing. Moreover, the polymer causes no degradation of DNAs in the blood, suggesting the possibility of further DNA profiling and identification after development. The mechanistic investigation suggests that the formation of positive or inverted images can be attributed to the synergistic effects from the affinity between polymer and blood, and the affinity betwen polymer and substrate, as well as the slight quenching of polymer fluorescence by blood. Furthermore, the covalent bonding between the protonated primary amino group and proteins in blood endows the stability of the developed fingerprints. The result rationalizes the molecular design of the fluorescent polymer and sheds new light on the future strategies to effective LBFP visualization in practical applications.

show abstract

Section: Resultsmentioning

confidence: 97%

“…As for the second type, the pattern is formed by the dark ridge and the fluorescent furrow, such as on substrates other than aluminum foil. The latter is called “inverted ridge” . The reason for formation of the inverted ridge will be discussed later.…”

Section: Resultsmentioning

confidence: 99%

Highly Stable, Nondestructive, and Simple Visualization of Latent Blood Fingerprints Based on Covalent Bonding Between the Fluorescent Conjugated Polymer and Proteins in Blood

Fan

Zhang

Chen

et al. 2021

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…Analysis of bloodstain pattern serves a significant role in reconstructing a criminal action and identifying suspects linked to the crime scene [9][10][11]. Blood fingerprints contain rich information to be used to identify a criminal suspect [12][13][14][15][16]. However, in many cases, the crime scenes are chaotic with limited evidence preserved.…”

Section: Introductionmentioning

confidence: 99%

Dye-soaked cotton pads for latent blood fingerprint development

Fan

Zhang

et al. 2020

SN Appl. Sci.

View full text Add to dashboard Cite

Visualization of latent blood fingerprints (LBFPs) at violent crime scenes is very important for identifying criminals, while current reagents/methods for developing LBFPs still have more or less limitations. Here, we advance a new strategy for LBFP development based on the dye-soaked cotton pads as "ensemble" materials. The cotton pad was first soaked in the dye solution and then placed on the substrate with deposited blood fingerprint for development. After peeling off the pad, uniform and legible fingerprint patterns were obtained in all cases where different dyes and substrates were employed. The dye-soaked pads displayed superior developing effect compared with those using conventional methods (immersing, smearing and spraying). The pad-based method exhibited many other merits, such as little damage to the fingerprint patterns and less dye stains left on fingerprint and substrate, as well as the reusability. This pad-based method was also applicable for developing sebaceous latent fingerprints by replacing the small molecular dyes with fluorescent conjugated polymer nanoparticles. In all, the dye-soaked cotton pad developing protocol is feasible, cost-effective and universally applicable for developing different types of latent fingerprints on various substrates.

show abstract

“…Geller reported a murder case in 2017 and investigated whether a wet finger in contact with a dry bloodstain would create a blood‐contaminated fingermark and suggested that a negative blood fingermark could be produced. Later, Geller and coworkers examined whether the color of ridges could be employed to discriminate the three mechanical models for fingermarks in blood: a blood fingermark deposited with blood‐contaminated finger, a nonblood fingermark subsequently contaminated with blood, and a blood‐contaminated surface in contact with a clean finger. They concluded that the color of ridges was unable to entirely determine the sequence of the fingermark and the bloodstain.…”

mentioning

confidence: 99%

Faux Blood Fingermark on Pistol: Latent Fingerprint Developed by Whole Blood

Lin

Luo

Xie

et al. 2019

Journal of Forensic Sciences

View full text Add to dashboard Cite

We present a case of a faux blood fingermark, wherein a natural latent fingerprint on the pistol at the crime scene was enhanced by the whole blood of the victim. A male was shot to death. The crime scene investigator did not find any blood fingermark during the collection of evidence, but a blood fingerprint was noticed in the firearms examination. We identified that the fingerprint was of the victim; a series of experiments on the nonporous substrate were then conducted; the death in this case was classified as a suicide. The phenomenon is interesting, and thus, calls for attention of the forensic community.

show abstract

Fingermarks in blood: Mechanical models and the color of ridges

Cited by 8 publications

References 2 publications

Highly Stable, Nondestructive, and Simple Visualization of Latent Blood Fingerprints Based on Covalent Bonding Between the Fluorescent Conjugated Polymer and Proteins in Blood

Highly Stable, Nondestructive, and Simple Visualization of Latent Blood Fingerprints Based on Covalent Bonding Between the Fluorescent Conjugated Polymer and Proteins in Blood

Dye-soaked cotton pads for latent blood fingerprint development

Faux Blood Fingermark on Pistol: Latent Fingerprint Developed by Whole Blood

Contact Info

Product

Resources

About