Page 40 - Veritas - 02.03.22

IMAGE: Nanoparticles adhering to the fingerprint residue

SOURCE: https://d2cbg94ubxgsnp.cloudfront.net/Pictures/480xA-

ny/2/8/7/124287_fingerprint-350-for-tridion_tcm18-200397.jpg

Further discussing the significance of different nanoparticles in

fingerprint analysis:

1. SILVER NANOPARTICLES

Silver nanoparticles have been employed since the 1970s in the UK for

the detection of fingerprints. The theory behind development using the

Ag-PD method was found in 1983.

• It works on the principle that colloidal silver has an affinity towards

the organic components present in the fingerprint residue.

• The Ag-PD technique is known to be the best for the development of

latent prints in wet conditions and on porous surfaces.

Iron salt is used to reduce silver nitrate to colloidal silver that reacts with

the organic part of the fingerprint residue to produce a black-

silvery image which aids in effective visualization.

2. SILICA NANOPARTICLES

IMAGE: Developing fingerprint using Silica

nanoparticle

SOURCE: https://d1otjdv2bf0507.cloudfront.

net/image-handler/ts/20200203055752/ri/750/

src/images/Article_Images/ImageForArti-

cle_5427_15807274706453894.png