Plastic Replicas in Firearms and Tool Mark Identifications

Biasotti, Alfred A.

doi:10.2307/1140214

Cited by 7 publications

(3 citation statements)

References 3 publications

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“…Most of the proposed methods had little or limited success due to timeconsuming techniques and unsatisfactory results. In 1938, Moritz proposed a technique utilizing cellulose acetate with an acetone or amyl-acetate vehicle for the reproduction and comparison of the individual characteristics on cartridge cases, bullets and breech faces (Morrrz, 1938;Biasotti, 1956). The only advantage of the technique was preparation of flexible, translucent cast that could be flattened and viewed by transillumination thus reducing or obviating the difficulties inherent in the direct observation of curved or inaccessible surfaces by reflected illumination.…”

Section: Preparation Of Castmentioning

confidence: 99%

“…It had larger application in studying the quality of finish on machined metal parts. The use of Faxfilm in law enforcement work has been reported, but literature on its practical application is meager (Science and Practice Committee Report, 1949;Biasotti, 1956). Cowles and Dodge have reported the successful application of Faxfilm to tool mark recovery and comparison and have pointed out its limitations when applied to deep impressions or to painted surfaces (Cowres, Davm L, Dodge, James K. A Method for Comparison of Tool Marks, 1948).…”

Section: Preparation Of Castmentioning

confidence: 99%

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Development of firing pin and breech face impression on lead and plasticine surfaces- a case report

Sehgal

Sahota

Kaur

et al. 2017

Egypt J Forensic Sci

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Background: The microscopic examination of fired cartridge cases and fired bullets helps the expert to determine if a suspect firearm/firearms were, or were not, discharged in a shooting incident. This is achieved by using a combination of class and individual characteristics. But in case of malfunctioning of firearm, experts have to adopt different methods to link fired cartridge cases and fired bullets with the suspected firearm. Case presentation: In this paper, a new method for the reproduction of the firing pin and breech face impression on two different surfaces are reported. Two chosen surfaces are plasticine and lead metal. Conclusions: The surface of the lead being soft and brittle reproduced the impression with maximum detail. Five match points were seen on the lead surface with clear demarcation whereas only three points of individual characteristics marks were observed on plasticine surface.

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Section: Preparation Of Castmentioning

confidence: 99%

Section: Preparation Of Castmentioning

confidence: 99%

Development of firing pin and breech face impression on lead and plasticine surfaces- a case report

Sehgal

Sahota

Kaur

et al. 2017

Egypt J Forensic Sci

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“…Plastic replicas have been used, and the methods published on, as far back as 1956 with high detail resolution (3). More recently, this method has been called double‐casting, where silicone mold negatives are made from master cartridge cases, and plastic replicas are created using the molds (4).…”

mentioning

confidence: 99%

Three‐Dimensional Analysis of Cartridge Case Double‐Casts

Law

Morris

2020

Journal of Forensic Sciences

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Due to the shot-to-shot variability in tool mark reproduction on fired cartridge cases, a method of replication is needed for the creation of training and testing sets. Double-casting is one method that has been used for this application, but the accuracy and variability of this method needs to be characterized. Three firearms were used to fire 25 cartridges each to create the master cartridge cases. The double-casting method consists of creating a silicone mold of the master cartridge case. A plastic resin mix is then poured into the mold to create the double-cast reproduction. Fifteen double-casts of each of the 75 fired cartridge cases were created across different silicone molds to analyze withinand between-mold variability. The master cartridge cases and double-casts were scanned with a confocal microscope (Sensofarâ S neox) to create three-dimensional representations of the surfaces. Two similarity metrics were used for the objective comparison of the double-casts to their master cartridge cases: the areal correlation coefficient (ACCF MAX) and the number of congruent matching cells (CMC). The ACCF MAX and CMC data, along with visual examinations, showed that the double-casting method produces accurate reproductions. Within-mold variability was found to be minimal, and between-mold variability was low. These results illustrate that double-casting can be applied for training and testing purposes.

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Visualisation by confocal microscopy of traces on bullets and cartridge cases

Bonfanti

Ghauharali²

2000

Science & Justice

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Plastic Replicas in Firearms and Tool Mark Identifications

Cited by 7 publications

References 3 publications

Development of firing pin and breech face impression on lead and plasticine surfaces- a case report

Development of firing pin and breech face impression on lead and plasticine surfaces- a case report

Three‐Dimensional Analysis of Cartridge Case Double‐Casts

Visualisation by confocal microscopy of traces on bullets and cartridge cases

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