Which chemical treatment is a silver-based reagent that reacts with chloride ions in fingerprint residues on non-porous surfaces, forming a dark gray or black-colored deposit?
A. Ninhydrin
B. Cyanoacrylate fuming
C. DFO (1,8-diazafluoren-9-one)
D. Physical Developer
Answer:D
Which chemical treatment is a silver-based reagent that reacts with chloride ions in fingerprint residues on non-porous surfaces, forming a dark gray or black-colored deposit?
A. Ninhydrin B. Cyanoacrylate fuming C. DFO (1,8-diazafluoren-9-one) D. Physical Developer
Explanation: Physical Developer is a silver-based reagent that reacts with chloride ions in fingerprint residues on non-porous surfaces, forming a dark gray or black-colored deposit and making the prints visible.