What happens to latent fingerprint evidence when exposed to certain chemicals or light technologies?

When latent fingerprint evidence is exposed to certain chemicals or light technologies, it becomes visible. This visibility allows investigators to examine and collect the prints more effectively. Latent fingerprints are typically not readily visible to the naked eye, as they are formed by the natural oils and sweat on a person's fingers.

Certain processes, such as fuming with cyanoacrylate (super glue), dusting with powders, or using ultraviolet light, interact with the components in the fingerprint left on surfaces, making them stand out against their backgrounds. This process is crucial in crime scene investigations, as it enables law enforcement to capture prints for comparison and identification purposes. The techniques used can vary depending on the surface on which the prints are found and the condition of the surface, but the end result is that the prints become observable, facilitating further analysis and aiding in the investigation.