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在勘查犯罪现场时,往往发现犯罪分子遗留在球面体(如灯泡、圆球形门把手)上的指纹,用一般的粉末显现,胶带提取,很难将指纹完整地提取下来,拍照则易产生变形。本人通过实验,发现用市售的聚乙烯醇合成胶水可简便地将指纹提取下来。 1 原理 聚乙烯醇合成胶水是一种浓稠状的透明粘合剂,将其滴在光滑物体表面,扩散后干燥可形成透明的薄膜,因其是种粘合剂,在干燥后可将附着于光滑物体表面的物质粘附住。所以用其提取
In the investigation of crime scene, often found criminals left in the spherical body (such as light bulbs, spherical door handle) on the fingerprint, with the general appearance of the powder, tape extraction, it is difficult to fully extract the fingerprint down, easy to produce deformation of the camera . I passed the experiment and found that the commercially available polyvinyl alcohol glue can be easily extracted fingerprints down. 1 Principle Polyvinyl alcohol synthetic glue is a thick, transparent adhesive, which will drop on the smooth surface of the object, after the spread of dry and can form a transparent film, because it is kind of adhesive, can be attached after drying The material on the surface of a smooth body adheres. So use it to extract