Traditional methods of latent Fingerprint Recovery
Latent fingerprints left at the scene of brands visible. Not found to convert latent print visible form. Therefore, the first task of the forensic scientist is to convert the hidden finger print marks visible. There are different approach to latent fingerprint recovery. With this, we will discuss three popular approach fingerprint visualization.
Powder Dust: This is the most popular method for extracting fingerprints from a crime scene. Dust powder is a perfect example of a physical method of fingerprint extraction solid surface. Two types of powder used to obtain fingerprints. One is the regular powder used in non-shining surface like a table top, door and television. Another is that the magnetic powders used on slick surfaces such as glass and plastic packaging. Fingerprint powder is available in different colors. Choice of color depends on the color of skin. White powder used in surface or deep black and the black powder used in surface brightness. Powder is poured on top and spread apart by a light brush. Fingerprint impressions are formed on the surface of copies and raised by adhesive tape.
Super-glue anger: it is also known as super glue vapor technology. Oil and sweat contains amino acids, glucose, ammonia and other organic compounds. The basic theory of super-glue technology to apply Cyanoacrylate anger that reacts chemically with organic constituents of the oil and sweat. Cyanoacrylate is a colorless substance that polymerized and used as a powerful adhesive. These chemicals are known as super-glue. Super-glue and suspect materials stored in a container airtight. Super-glue-fumes created by heating at a temperature of 120-140 degrees. The acid reacts with the organic constituents of oil and sweat it is removed from the finger. Chemical reaction to form an impression of latent fingerprints.
Iodine angry: This is one of the oldest scientific methods of latent fingerprint recovery. Although the process of obtaining latent fingerprints super glue and iodine anger angry about the same, but there are major differences between the two technologies. While hate super glue technology depends on the chemical reaction of the materials super glue, anger iodine based on the physical properties of iodine. In anger iodine, oils and fats obtained iodine vapor while and that the results of changing colors, from clear to dark brown. However, a change began to fade within a short time. Therefore, 1% starch solution sprayed water to change the color of dark brown to blue. Change color generally lasts for one or two weeks. Contrast of fingerprint impressions create a good image contrast latent fingerprint.