Latent print Nada ALJuaid introduction Lifting fingerprints from

Latent print Nada ALJuaid

introduction Lifting fingerprints from a crime scene is important evidence for determining a possible suspect.

Types of prints at a crime scene plastic prints: left on a soft material such as wax, putty, soap, or dust visible prints: are prints contact with a colored material such as blood, and ink… latent or invisible prints: are impressions caused by the transfer of body perspiration or oils present on finger ridges to the surface of an object.

Techniques to visual latent Fingerprint. Powders iodine fuming The cyanoacrylate fuming (the super glue) Ninhydrin

powders black composed of black carbon or charcoal, is applied to white or light-colored surfaces. gray composed basically of an aluminum dust, is used on dark-colored surfaces. Then lifted with a piece of clear tape

Iodine fuming natural body fats and oils in sebaceous material of a latent print temporarily absorb the iodine vapors. This results in a change in color, from clear to a dark brown

The cyanoacrylate fuming (super glue is a procedure that is used to develop latent fingerprints on a variety of objects.

Ninhydrin interacts with the physical qualities of amino acids in the latent residue and will produce a blue or purple color.