A Study on the Combined Application of Vacuum Metal Deposition Method and Traditional Latent Fingerprint Development Method

Purpose:vacuum metal deposition is a new method with wide application and good developing effect of the latent fingerprint.In order to improve the appearance rate of fingerprints on the crime scene, the joint application and mutual complementing effect of this method and the traditional method were studied.Methods:the latent sweat fingermarks on the surfaces of common permeable objects, non-permeable objects, and semi-permeable objects were developed by combining the vacuum metal deposition method with traditional methods, and the developing effects were compared.Results:the combination of vacuum metal deposition method with powder method, "502" method, ninhydrin method, and other traditional methods had a better enhancement effect on the development of fingerprints, especially the development of fingerprints on the surface of objects with complex background color and reflective objects.The vacuum metal deposition method had a pronounced complementation effect on the traditional methods.Conclusion:under certain conditions, the vacuum metal deposition method can be combined with the traditional method to enhance the contrast between fingerprint and background and enhance the developing effect of the fingerprint.