Nuevas aportaciones al procesado de huellas labiales. Los lisocromos en queiloscopia.

Abstract

Latent lip prints can be one of the evidences that can be finded in a crime scene. These prints are originated when the lips are covered by permanent or transparent lipsticks. The importance of these evidences in Criminalístics is double: first, the study lips lines and wrinkles could be useful for identification, in the other hand, lip prints can contain remains of biological material to realize a genetic identification. The study of the latent lip prints needs first its developing. This work study differents mechanical developers used in dactyloscopy and some lysochromes (dyes for fats), in the developing of latent lip prints originated by permanent and protective lipsticks, on different porous supports. There is valued the behavior of the above mentioned developers depending on the antiquity of the lip print, and the origin of the same one, the method of applying the reagent (in powder or in solution) and the surface on which it has settled, since the used supports change of color, texture and composition. Results show that lysochromes are very useful for the developing of latent lip prints on porous supports, so much in recent as ancient lip prints. Of the used developers, the most effective is the Sudan Black, except in those surfaces that do not allow a good contrast. Besides, this reagent does not interfere in ADN extraction.