Görünmeyen parmak izlerinin vakum metal çökeltme tekniği ile belirlenmesi
Özet
Visualization Of Latent Prints By Using Metal Deposition Technique This method is developed especially for the enhancement of the latent prints impressed by water, or for enhancing the prints on banknotes, on leather surfaces, on poliethylen bags, on photo negatives and on photo prints, or on glass, in place of others that failed in visulization of latent prints on these surfaces. Firstly, gold particles are evaporated in an airless chamber to create a thin metal layer on the surface which will be examined. In the same manner, a zinc layer is formed on the surface in the second step. Golden layer is deposited on the surface and it penetrates in latent print residues. While friction ridges remain visible, the surface is coated by zinc. In this study, with the examination of 425 latent prints on various surfaces; It has been found out that, by making use of gold and zinc combination, among all latent prints, % 78 of them were enhanced as comparable fingerprints; this ratio was % 68 when copper element was used, % 72 when magnesium element was used and % 62 when silver element was used. The application of metal deposition technique has % 64 of success on the materials impressed by water, % 57 of success on banknotes and synthetic clothes, % 80 of success on materials that were left on different dates, and % 86 of success if it is performed after the application of cyanoacrylate and flouresence examination. The establishment of metal deposition in vacuo is very expensive, however it helps us to find out the details in case the other methods are not successful. It is concluded that, after the application of cyanoacrylate and flouresence examination, metal depositioning gives better results.Key Words: Metal coating, latent fingerprint, metal deposition, poliethylen, non porous surface.