Cyanoacrylate 중합 반응 개시제의 보충을 통한 노화 잠재지문 현출 증강에 관한 예비 연구
Improved Development of Aged Latent Fingerprints with Sodium Lactate in Carrier Powder Treatment before Cyanoacrylate Fuming: A Preliminary Study
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초록
Cyanoacrylate (CA) fuming 법에서 노화된 잠재지문은 CA 중합반응 개시제의 손실과 수분 증발 등의 이유로 현출 저하가 발생하는 것으로 알려져 있다. 본 연구에서는 CA 중합반응의 개시제로서 sodium lactate를 캐리어 분말인 SiO2, Al2O3와 각각 혼합하고, 노화된 잠재지문에 CA 훈증 전 처리하여 현출 증강을 시도하였다. 현출된 지문을 육안, 농도계 이미지 분석을 통한 선명도 측정, 특징점 개수 측정을 통해 비교 분석한 결과, 전 처리한 지문이 빠르고 선명하게 현출되어 미처리 지문보다 상대적으로 우수한 현출 결과를 보였다.
Abstract
The cyanoacrylate (CA) fuming method, a primary choice to develop latent fingerprints on nonporous surfaces, shows limited efficiency with aged fingerprints because of the degradation of the lactate ion, the proposed initiator of the CA polymerization, and evaporation of water etc. Therefore, we tested the pre-treatment of sodium lactate (mixed with carrier powder; SiO2 and Al2O3) on aged fingerprints before CA fuming to improve development efficacy. This modified CA fuming method provided a fast, clear, strong and efficient development. The improved number of minutia points and larger areas of the ridges in treated fingerprints compared to untreated fingerprints were found. Further studies using other surfaces and other carrier powders are needed to qualify this modified CA method that could be used for the improved development of the aged fingerprints.
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