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Latent fingerprints are typically not visible to the naked eye and are formed when the natural oils and sweat from a person's skin are transferred onto a surface, leaving behind an impression. Unlike visible prints, which are made when a finger comes into contact with colored substances like ink, latent prints require special techniques to be visualized and collected, such as dusting for fingerprints or using chemical treatments.

This definition aligns with the choice that describes them as impressions left on a surface. The nature of latent fingerprints makes them significant in forensic investigations, as they can provide crucial evidence in identifying individuals who have touched an object or surface at a crime scene.