Fingerprints

Silver nitrate reacts with the sodium chloride present in sweat residues of latent fingerprints to form silver chloride. Upon exposure to ultraviolet light, the silver chloride darkens, making the fingerprint visible. This method is particularly useful on porous surfaces.

Latent fingerprints are invisible to the naked eye and require special techniques, such as dusting powders, chemical reagents, or light sources, to make them visible. They are formed by the natural oils and sweat from the skin and are commonly found at crime scenes.

Ridges are the structural features of fingerprints, not a specific pattern. The three primary fingerprint patterns are whorls, arches, and loops, which are used in forensic analysis for classification and identification.

A Lateral pocket loop is a unique fingerprint pattern where two separate loops overlap, with each loop having its distinct core. This pattern is less common and is categorized under composite fingerprint patterns.

Latent fingerprints, which are invisible to the naked eye, are made visible using methods like iodine fuming. This technique involves exposing the surface to iodine vapors, which react with oils and sweat residues in the fingerprint, creating a temporary visual impression. Neutron Activation Analysis and casting are unrelated to fingerprint development.

Super glue fuming, or cyanoacrylate fuming, is a widely used forensic technique for visualizing latent fingerprints on non-porous surfaces like metal, plastic, and glass. The cyanoacrylate vapor polymerizes on the fingerprint residues, creating a visible white print.

Francis Galton authored the book “Fingerprint,” which laid the foundation for the scientific study and classification of fingerprints. His work highlighted the uniqueness of fingerprints, making them a vital tool in personal identification and forensic science.

AFIS stands for Automated Fingerprint Identification System. It is a computerized system used to store, search, and match fingerprint data efficiently. This technology is critical in modern forensic investigations for rapid identification.

A radial loop is a fingerprint pattern that opens toward the thumb side of the hand. This classification is based on the flow direction relative to the radius bone, making it distinct from ulnar loops that flow toward the little finger.