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KMID : 0385520220350060237
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Analytical Science & Technology
2022 Volume.35 No. 6 p.237 ~ p.241
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Washing effect of fingermark contaminated with flammable liquids
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Jang Ho-Won
Kwon Ji-Yun
Kim Hyo-Mi
Yoo Seung-Ju
Hong Sung-Wook
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Abstract
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The effect of washing fingerprints deposited on glass that were contaminated with a flammable liquid (gasoline, kerosene, diesel, and thinner) was studied by washing with hexane or heptane. The fingerprints were visualized using fuming cyanoacrylate, followed by basic yellow 40 staining. After comparing the washing effect, by dividing one fingerprint into four sections, it was confirmed that the ridge detail was damaged by dissolving the fingerprints in flammable liquid. As a result of washing fingerprints contaminated with flammable liquids using hexane or heptane, fingerprints contaminated with gasoline, kerosene, and thinner did not show a washing effect because the ridge detail was damaged at the time of contamination, and only fingerprints contaminated with diesel exhibited improved ridge detail quality. Because hexane and heptane washing damage the ridge detail, it was found that fingerprints contaminated with gasoline, kerosene, and thinner were better enhanced directly without the washing process. In addition, it was found that the amount of the washing solvent and contact time should be minimized when washing fingerprints contaminated with diesel.
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KEYWORD
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fingermark, flammable liquid, contamination, washing
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