A print from the sole of the foot can also leave an impression of friction ridges.ĭeliberate impressions of fingerprints may be formed by ink or other substances transferred from the peaks of friction ridges on the skin to a relatively smooth surface such as a fingerprint card. ![]() In a wider use of the term, fingerprints are the traces of an impression from the friction ridges of any part of a human or other primate hand. These are sometimes referred to as "Chanced Impressions". ![]() Fingerprints are easily deposited on suitable surfaces (such as glass or metal or polished stone) by the natural secretions of sweat from the eccrine glands that are present in epidermal ridges. The recovery of fingerprints from a crime scene is an important method of forensic science. ![]() A fingerprint in its narrow sense is an impression left by the friction ridges of a human finger.
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