Which method is used to chemically develop latent fingerprints?

The use of super glue fuming or chemical reagents is the correct method for chemically developing latent fingerprints. Latent fingerprints are often not visible to the naked eye and require specific techniques for enhancement. One common method involves fuming cyanoacrylate, commonly known as super glue. The fumes adhere to the moisture and lipids present in the fingerprint residue, resulting in a visible white impression that can be photographed or lifted for analysis.

Chemical reagents such as powder or ninhydrin can also be utilized for developing latent prints on various surfaces. Ninhydrin reacts with amino acids found in the fingerprint residue and produces a colored compound, allowing for better visibility of the print.

In comparison, exposure to UV light, application of heat, and spraying with water do not enhance latent fingerprints effectively. UV light may make certain materials fluoresce, but it does not work on the oils and sweat that comprise latent fingerprints. Heat could potentially damage fingerprint residues or the surface containing the print, and spraying with water is not a viable method, as it could wash away the fingerprint or further obscure it rather than develop it.