Journal of the Korea Convergence Society (한국융합학회논문지)

Korea Convergence Society (한국융합학회)
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Comparison of Enhancement Effect of Ninhydrin Fluorescent Fingerprints Using Zinc Chloride and Liquid Nitrogen and Introducing the New Cooling Method for Post Treatment of Ninhydrin

염화아연(Zinc Chloride)과 액화질소를 사용한 닌히드린(Ninhydrin) 형광지문의 증강 효과 비교 및 실무적 사용을 위한 새로운 냉각방법에 관한 연구

  • Jeon, Su-Yeon (Division of Forensic Science, Soonchunhyang University) ;
  • Kim, Chang-Yong (Division of Forensic Science, Soonchunhyang University) ;
  • Kim, Mi-So (Division of Forensic Science, Soonchunhyang University) ;
  • Yu, Je-Seol (Division of Forensic Science, Soonchunhyang University)
  • 전수연 (순천향대학교 법과학대학원) ;
  • 김창용 (순천향대학교 법과학대학원) ;
  • 김미소 (순천향대학교 법과학대학원) ;
  • 유제설 (순천향대학교 법과학대학원)
  • Received : 2020.04.01
  • Accepted : 2020.06.20
  • Published : 2020.06.28
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Abstract

We identify the enhancement effects of zinc chloride and liquid nitrogen on low quality ninhydrin-developed fingerprint and we wanted to find out another cooling methods available for ninhydrin/Zn fingerprint enhancement besides the liquid nitrogen, which is hard to access. Artificial sweat was used to make the same level of fingerprints, and fingerprints developed by each technique were evaluated by SWGFAST standard and compared the average score and standard deviation. As a result of the experiment, ninhydrin/Zn-liquid nitrogen got 3.2 and 3.3 as average scores that enough to identify an individual such as 1,2-IND/Zn or DFO. Also, experiments using dry ice instead of liquid nitrogen as a way of the ninhydrin/Zn-developed fingerprints enhancement resulted in 3.0 and 2.9 as average scores, therefore, it was confirmed that dry ice is also a sufficient cooling method to be considered in practice in the field of forensic science.

법과학 분야에서 닌히드린(ninhydrin)은 다공성 표면 증거물에 남겨진 잠재지문을 현출하기 위해 사용하는 대표적인 시약이다. 하지만 지문 유류물의 양이 적은 잠재지문을 닌히드린으로 현출하면 개인식별을 하기에 충분하지 않은 지문이 현출될 가능성이 있다. 본 연구에서는, 이와 같이 품질이 낮은 닌히드린 현출 지문을 증강하기 위해 사용하는 염화아연과 액화질소의 효과를 알아보고, 쉽게 접하기 힘든 액화질소 외에 닌히드린/Zn 지문에 적용할 수 있는 또 다른 냉각방법이 있는지 찾아보고자 하였다. 동일한 수준의 지문을 제작하기 위해 인공 땀을 사용하였고, 각 기법으로 현출한 지문을 SWGFAST 기준을 통해 평가받아 평균과 표준편차를 비교하였다. 실험 결과, 닌히드린/Zn-액화질소는 3.2, 3.3점의 평균점수를 받아 1,2-IND/Zn, DFO와 마찬가지로 개인식별이 가능한 수준의 증강 효과를 보였다. 또한, 닌히드린/Zn 지문을 증강하는 방법으로 액화질소 대신 드라이아이스를 사용한 실험에서는 3.0, 2.9점의 평균점수가 나와, 실무적으로 충분히 고려해볼 수 있는 냉각 방법이라는 것을 확인할 수 있었다.

Keywords

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