What type of fingerprints are generally not visible without developing?

Latent fingerprints are the type that typically cannot be seen with the naked eye and require the use of various techniques to develop and reveal them. These fingerprints are formed when natural oils and sweat from the skin are transferred onto a surface, leaving an impression that is not immediately visible.

Common methods for developing latent fingerprints include dusting with powders, using chemical reagents, or applying special light sources. The process of revealing these prints is crucial for forensic investigations, as they can provide valuable information about the identity of individuals involved in a crime.

In contrast, patent fingerprints and impressed fingerprints are either visible without any development or are impressions left in soft materials, respectively. Understanding the characteristics and behaviors of these different types of fingerprints is essential for effectively collecting and analyzing evidence at a crime scene.