Which method is very effective when non-porous surfaces such as Metals and Plastics are covered with a grease or oil?
A. Ninhydrin
B. Cyanoacrylate fuming
C. Silver nitrate
D. Sudan Black
Answer:D
Which method is very effective when non-porous surfaces such as Metals and Plastics are covered with a grease or oil?
A. Ninhydrin B. Cyanoacrylate fuming C. Silver nitrate D. Sudan Black
Explanation: Sudan Black or Solvent black 3 may be used to develop latent fingerprints on a non-porous surfaces such as Metals and Plastics are covered with a grease or oil. The image produced by the reaction of this dye with the fatty constituents present in the latent fingerprints are blue-black in colour.