Fingerprint Detection
Maryam Sarbast and Hiba Nuruz
Shahan high School class 10 A
Types of Fingerprint
Identification
Fingerprint an ink impression
of the lines upon the fingertip
taken for the purpose of
identification
Arches
Arches are found in approx 5%
of the recorded fingerprints. In
an Arch pattern, ridges enter
from one side travel to the other
side, and lift slightly at the
center of the pattern
Loops
Around 60-65% of the recorded
fingerprints are loop which
makes it the most common
fingerprint pattern in the
population. A loop is formed
when one or more ridges enter
from a side
Whorl
Whorl is found in the approx.
30-35% of the recorded
fingerprints of the population.
In a whorl, the ridge enters
from a side making a complete
spiral around the core of the
fingerprint and terminate or
tend to terminate at the core.
Fingerprint
identification
has revolutionized forensic
science
and
personal
identification. From crime
scenes
to
unlocking
smartphones,
fingerprints
have proven reliable and
unique identifiers.
Ninhydrin test
Ninhydrin is the most
widely used chemical
reagent for the detection
of latent fingermarks on
porous surfaces such as
paper and cardboard.
The compound reacts
with the amino acid
component of
Latent” fingerprint (eccrine)
the fingermark deposit
Latent” fingerprint is a to give a dark purple
fingerprint that is not product known as
apparent to the eye but can Ruhemann's purple
be made sufficiently visible,
as by dusting or fuming, for
use in identification. Latent
fingerprints typically do not
fluoresce on their own.