تسجيل الدخول

تسجيل

?WHAT’S A FRICTION RIDGE PRINT MADE OF

المؤلف:  Max M. Houck، Jay A. Siegel

المصدر:  Fundamentals of Forensic Science

الجزء والصفحة:  500

2026-08-23

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WHAT’S A FRICTION RIDGE PRINT MADE OF?

A friction ridge print is a representation of a friction ridge pattern in some medium. Friction ridge prints can be classified as either patent, if they are visible with the unaided eye, or latent, if they require some sort of assistance to make them visible. Patent prints can appear because of some transferable material on the ridge pattern, such as liquid blood, liquid paint, or dust, or because the ridge pattern was transferred to a soft substrate that had “memory” and retained the impression, like clay, fresh paint, or putty. Latent prints are composed of the sweat and oils of the body that are trans ferred from the ridge pattern to some substrate where they persist for some time until found by one of numerous visualizing techniques. The most familiar visualizing technique is the use of fingerprint powder, colored, fluorescent, or magnetic materials that are very finely ground, which is brushed lightly over a suspected print to produce contrast between the background and the now- visible print.