What are the different methods of fingerprint detection?

There are a number of different methods of fingerprint detection and the method used generally depends on the type of fingerprint and the substance on which the printing occurs. One of the simplest types of detection is visual finding and shooting a visible fingerprint on the surface. However, this is not practical for latent fingerprints, and therefore a number of other means are usually used, which often include the application of a chemical, which makes visible fingerprints or allow them to capture other means. Newer fingerprint detection methods usually have to capture the fingerprint image without the introduction of other chemicals that can potentially damage the fingerprints as evidence.

Fingerprint detection is usually the process of searching and documentation of fingerprints during some form of criminal investigation. It has been used for more than a century in an effort to identify people who have been involved in a crime, typical unidentified suspicious. The process usually involves finding fingerprints through a number of different methods and PObser photography or otherwise capture a picture of printing for future use.

In general, there are three different types of fingerprints that can be found and documented by detecting fingerprints. The first two types are visible forms of fingerprints and finding them usually include basic visual search and observation. Indented or formed fingerprints are physically made in a soft or malleable substance such as wax or sealant; Visible fingerprints are made in a way that is easy to see. This may include fingerprints that are positive images resulting from the finger that had ink or blood on it and placed on the surface, leaving the image of the fingerprint. There are also negative images such as a dusty shelves that reveal a fingerprint that remains in the dust -finger touched by the shelf.

The third type of fingerprints that can be found by detecting fingerprints are latent prints, those that do notThey are easily visible by basic visual search. These prints are often left on the surface and consist of natural oils of the finger skin that remained on the surface. Detection of these types of prints of fingerprints often involves processes that allow prints to become visible to documentation.

This type of fingerprint detection is usually achieved by applying chemical liquids or powders such as 1.8-Diazaflouren-9-one (DFO) that make oils or amino acids in fingerprint fluoresce in a way that can be seen or otherwise photographed. However, there are some problems with these methods, such as relying on the contrast between the UTIS and the surface on which it is located, and the potential to destroy these chemicals or corrupt the print. Newer methods include the use of techniciiques such as Micro-X-Ray fluorescence (MXRF) to avoid changing fingerprints, but instead capture the image digitally. This type of system detects and photographs salts and other chemicals present in human sweatto capture the image without applying any chemicals to it.