Study on the Appearance of Latent Fingerprints on Paper Objects Using Indendione-silver Nitrate Composite Film
Fingerprint evidence research has been one of the hot spots in criminal science,especially the latent fingerprints.The components of latent fingerprints are made up of natural substances secreted by various glands in the human skin.Based on the unique characteristics of fingerprints,the project first determined the optimal concentration of indanedione,silver nitrate reagents,the indenedione-silver nitrate composite developing film was prepared by mixing the two materials,and the effect of retention time on the film was studied.In order to improve the method of latent fingerprint display,the effect of indanedione-silver nitrate composite display film on the surface of printing paper,Kraft paper,photo paper and filter paper was studied,in the field of fingerprint display to obtain a stable effect,a wide range of applications,efficient and simple,low-cost has a good prospect of application of the display technology.
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