Which statement about liftable prints on various materials is true?

• A. Untreated wood
• B. Wrinkled plastic bags
• C. Heavily oiled items
• D. All of the above

Answer: (D)

Liftable prints come from latent fingerprints that can be recovered from a wide range of surface types with the right technique. Untreated wood, though porous, can retain sweat residues in its microstructures, so using appropriate developers for porous surfaces (like ninhydrin or similar reagents) lets you reveal the print and lift it. Wrinkled plastic bags present a textured nonporous surface, but prints can still be captured by methods such as cyanoacrylate fuming followed by powdering and lifting, since the ridges and residues are made visible and transferable. Heavily oiled items may seem challenging, but with procedures that remove or mitigate oil and then apply suitable development, a print can still be revealed and lifted. So the true statement is that liftable prints can be obtained from all of these materials when the proper technique is used.