Acriminalist uses a fluorescent chemical called rhodamine, cyanoacrylate fumes, and a uv light source to see a fingerprint on a gun. which type of evidence is he detecting?

gross evidence
latent evidence
direct evidence
trace evidence

The answer is latent evidence. Evidence that can't be seen by the naked eye. These are hidden pieces of evidence.This evidence needs special tools, chemicals or materials to exposed them. Such items like cyanoacrylate fumes and UV light source are used to see the finger print on a gun.