감압, 감열지에서의 잠재지문 현출
Detection of Latent Fingerprint in Carbonless and Thermal Papers
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초록
: 범죄현장에서 증거물로 채택되는 지류 중 감압, 감열지에서의 잠재지문 현출에 대한 연구이다. 감압, 감열지는 사용목적에 따라 지면에 발색제, 현색제로 코팅하여 열이나 압력에 의해 이미지를 형성하게 하는 특수지류이다. 감압, 감열지 각3종을 선택하여 각각의 지면을 분리하고 다양한 화학적 현출법으로 잠재지문 현출효율을 비교하였다. Methanol이나 acetone 에 용해된 Ninhydrin시약의 사용은 지류의검은색으로의 변화와 필적과 인쇄된 문자의 잉크번짐이 관찰되고 감열지의 경우 90 o C 이상의 열에 의해서도 처리에 의해서도 지류의 변화를 확인할 수 있어서 지문현출과 증거보전적인 의미에서 부적절한 방법임을 확인하였다. 본 실험으로 지류지면에 따른 다양한 현출효율을 확인할 수 있었고 Iodine fuming 법이후 HFE(hydrofluoroether) 나 CFC(chlorofluorocarbon) 를 용매로 하는 Ninhydrin법으로 재처리가 효과적임을 알 수 있었다.
Abstract
The aim of this paper is to investigate the effective developing method of latent fingerprint on thermal and carbonless paper in crime scene evidence. Thermal and carbonless papers are specialty papers which were coated with coreactant (color former), developer dyes and sensitizer on paper according to purpose of using. In addition yield by variety image by heat and pressure. We compared the developing of latent fingerprint by chemical method on three different thermal and carbonless papers each side. The blackening and ink’s bleeding, running on handwriting and machinery document is caused by the use of organic polor solvents like methanol, acetone, etc as ninhydrin solutions and it is also due to the developing temperature of 90 o C-100 o C. This method was unsuitable for developing latent fingerprint and conserve of evidence. Through this work, it was determined that various efficiency of latent fingerprint developing according to characteristic of side of each paper and iodine fuming followed by ninhydrin in HFE (hydrofluoroether) or CFC (chlorofluorocarbon) as a carrier solvent yielded the most effective results, respectively.
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