O. Kofanova

Summary

In the article technical equipments, methods and materials are considered for the exposure of tracks of dactyloscopic origin, which is presented at the market of Ukraine by manufacturing companies. It is also reveals factors, which influence on forming of track, limitation of dinting, temperature condition, humidity of air, and also properties of surface and composition of sweat and fatty substance. It is considered in detail the issue of RUVIS device application, whose work is based on image formation in the reflected ultraviolet light. With the help of this device find out latent tracks of hands without their previous treatment dactyloscopic powders are detected by chemical reagents and others like that. The device can be used in various conditions: in daylight or in total darkness, indoors or in open areas; it makes it possible to identify and photograph latent traces of hands from a distance.

The article also deals with various methods for detecting traces of fingerprinting origin using titanium dioxide and molybdenum disulphide. The solution is used on wet surfaces; surfaces covered with salt, dirt, grease (for example, car surfaces in rainy weather or objects raised from reservoirs) where the use of ordinary fingerprints can ruin the track.

Rhodamine 6g and Basic yellow 40 is used to reveal traces on a metal, glass, skin, the plastic arts and other objects. Base yellow 40 is used on such surfaces, as canning jars, skin and plastic and also multicoloured surfaces. It dissolves with reagents that contain alcohol. Intensive yellow-green fluorescence occurs at 365 and 485 Nm. Luminol — an aqueous solution of 3-aminophthalhydrazite and sodium carbonate, is used to detect traces of hands formed by blood, fruit and vegetable juices, as well as some paints and powders of metals.