ニンヒドリン‐酢酸溶液およびスプレーガンによる潜在指紋の検出

概要

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Two methods for developing latent fingerprints were examined by use of ninhydrin-acetic acid solution and spray gun. In one method, latent fingerprints were developed without heating by ninhydrin- acetic acid solution which contains 10 vol% of acetic acid and 90% of ninhydrin solution. The solution was brushed on paper, then it was enclosed in a plastic bag after volatilization of the solvent. Fingerprints were developed within 30 minutes without heating. This method was found to be useful for the development of latent fingerprints where heating devices such as an iron could not be used. In another method, latent fingerprints were developed by spraying gold powder on objects with a portable gas cylinder. Gold powder is the alloy of copper and zinc. Clear fingerprints were obtained because a brush was not required to develop them. This spray gun method could be applicable to all objects on which latent fingerprints were developed by the usual powder method, and was especially effective on oil-prints.
日本法科学技術学会の論文