몇 가지 식용색소를 이용한 Cyanoacrylate 훈증 현출지문의 개선에 미치는 색 대비효과
Color Contrast Effect on an Improvement of the Developed Latent Fingerprints by Cyanoacrylate Fuming Method Using Some Edible Colorants as Enhancing Agents
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초록
Cyanoacrylate (CA) 훈증에 의하여 현출된 5종류의 비다공성 재질(I-V)에 유류된 잠재지문들의 현출 해상도를 개선하기 위하여 현출 증강제로서 다양한 8종의 무독성 식용색소(1-8) 분말들을 처리한 결과로부터 다음과 같은 결과들을 얻었다. 흑색분말 및 색소 분말들은 유리 스라이드(I)에서 개선효과(C)가 높았으며 여러 재질에서 흑색분말이 양호한 경향이었다. 특히, 색의 3요소(색상, 채도 및 명도)값을 CA현출 후 색소분말에 의하여 가장 양호한 개선효과를 나타내었던 유리 스라이드(I) 표면에 유류된 잠재지문의 평균 특징점(C) 값들과의 관계를 분석한 결과, 평균 특징점(C) 값과 색상은 반비례(부 대비효과) 관계를 나타낸 반면에 채도 및 명도는 비례(정 대비효과) 관계를 나타내었다. 결론적으로 현출성에 기여하는 색 요소들의 분포 차이를 나타낸 방사형 차트의 분석결과로 부터 색소 분말들(3, 5, 7 및 8번)은 모델 2에 근거하여 명도대비 및 채도대비 효과가 잠재지문의 개선에 큰 영향을 미치는 주 요인이었다. 그러므로 색소분말은 비다공성 재료의 바탕색과 보색관계일 경우에 유용하게 활용될 수 있을 것으로 판단된다.
Abstract
To improve the resolution of developed latent fingerprints that are deposited on 5 nonporous surface materials (I-V) by cyanoacrylate (CA) fuming, by using 8 different kinds of edible nontoxic colorant powders (1- 8) as enhancement agents the following results have been obtained. The improvement effect (C) was exceptional when black powder and colorant powders were used on the glass slide (I) when the development results by black powder on the other materials were just satisfactory. Particularly, the relationship between three elements of color (hue, chroma & brightness) and average minutiae values (C) of fingerprint enhanced by colorant powders (1-8) on the glass slide (I) was analyzed as follows. The relationship between the average values (C) and hue indicates an inverse proportion (negative contrast effect), while the relationship of chroma and brightness indicates an reciprocal proportion (positive contrast effect). In conclusion, the colorants (No. 3, 5, 7 & 8) from the analytical results of the radar chart have shown that the brightness and chromatic contrast effect based on the optimized model 2 had a big impact as major factor on the improvement of latent fingerprints. Therefore, it seems that the colorants can be useful when they complement the background color of nonporous materials.
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