Which method is commonly used to develop faint or aged fingerprints on porous surfaces, such as paper or cardboard?
A. Ninhydrin
B. Cyanoacrylate fuming
C. Silver nitrate
D. Indanedione
Answer:D
Which method is commonly used to develop faint or aged fingerprints on porous surfaces, such as paper or cardboard?
A. Ninhydrin B. Cyanoacrylate fuming C. Silver nitrate D. Indanedione
Explanation: Indanedione is a chemical compound that is commonly used to develop faint or aged fingerprints on porous surfaces, such as paper or cardboard. It reacts with the amino acids present in the sweat and oils of fingerprints, producing a purple or pink-colored reaction that enhances the visibility of the fingerprint.