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14 Apr Ohio University Forensic Chemistry Lab, Ballistics



Undergraduate students in a Forensic Chemistry Lab demonstrate how to use a comparison microscope for bullet and bullet casing comparisons, and color developments tests for impression marking enhancement (such as for filed-off serial numbers).

The production of this video was supported through a grant from NSF (0745590), and is freely available for educational purposes. The opinions expressed in this video are those of the students and do not necessarily reflect those of Ohio University or the National Science Foundation.

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MOST RECENT COMMENTS
7 Comments
  • Glen Jackson
    Posted at 14:15h, 14 April

    It would help to know at which time of the video you are referring to. For cartridge case comparisons, we are normally looking to match the firing pin impression or the ejection marking, so I'm not sure what the parallel lines would refer to on the case. For the bullet comparisons, yes, the bullets–and therefore striations (parallel lines?)–should face the same way.

  • ForensicGunStuff
    Posted at 14:15h, 14 April

    I thought both ladies did a terrific job explaining some of the functions of a firearm Lab.

    I was just wondering during the cartridge case comparison, if the cartridge cases were rotated so that the parallel lines were in the same direction would this have displayed a match? Thanks

  • Glen Jackson
    Posted at 14:15h, 14 April

    The ejector/extractor markings on the spent cartridge can be compared to those of other cartridges from the same gun. However, these markings are usually not as unique as bullet striations.

  • Redlion991
    Posted at 14:15h, 14 April

    Could cases form a gun be matched back to a gun

  • Glen Jackson
    Posted at 14:15h, 14 April

    Good point. I believe she wanted to say something like "impression" but couldn't find the word in the moment.

  • TheFirearmEnthusiast
    Posted at 14:15h, 14 April

    She's talking about straitions on the bullets when she's looking at the cases. How does that work?

  • SeaDog
    Posted at 14:15h, 14 April

    Cases not casings.

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