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Most fingerprints can't be seen to the eye and require a chemical development process in order to make them shown.

大多数指纹是肉眼看不见的，需要经过化学显影过程才能显示出来。

youdao

People whose fingerprints have worn off because of burns or overuse often find that the smooth calluses that develop on the fingertips make it nearly impossible to maintain a grip on anything.

那些由于灼伤或是过度使用双手而导致指纹磨损的人常常感觉表皮光滑的指尖要抓紧任何东西几乎不太可能。

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In 1892 Galton looked at the pattern of whorls, arches and loops that make up fingerprints, and estimated that the chance of two prints matching at random was about one in 64 billion.

ECONOMIST: Fingering fingerprints

With the exception of the Apple logo, the back and sides have a matte finish that make them impervious to fingerprints.

ENGADGET: We've got iPhones, what do you want to know?

If they can pick up fibres or fingerprints from a crime scene, they can trace it back to the year, make, model of the car that the fibre came from and the thumb that left the fingerprint.

BBC