Thames & Kosmos Forensic Fingerprint Lab handleiding

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Tracking Down Fingerprints

The Science Behind Fingerprints

Important!

Step 7

When you have ﬁlled up the card, write the date

along with the name and age of the person. It is

also important to note whether the ﬁngerprints are

from the left or right hand. Then, you can use the

magnifying glass to study special features of the

prints more precisely and note them too.

Step 8

In addition to the rolling method, you can also use

the plain or ﬂat method, which takes prints of the

ﬁngers simply by pressing. Fingerprints can be made

using either method. The rolling method, however,

which is the one you have already used, only shows

the ﬁrst section of the ﬁnger.

Step 10

It can be pretty exciting to use your ﬁngerprint set

in a manhunt game. First take ﬁngerprints from

all the kids who will be playing the game, using

the techniques you learned above. Then search

for ﬁngerprints a mock “crime scene.” They are

easiest to ﬁnd if you shine light onto ﬂat surfaces

from various angles while looking through the

magnifying glass. Now secure the ﬁngerprints as

explained in Steps 1-3. Then you can compare them

against the ﬁle cards. If you get a match, you may

have identiﬁed a “suspect.”

You can record scar lines or marks in the “special

characteristics” ﬁeld. To protect the prints on the

card, cover each one with a transparent sticker. You

can design a ﬁle card for your left hand using the

same method.

Important: Be very careful not to

stain anything with the ink. After

using the ink pad, please wash

your hands!

Step 9

How to compare and identify fingerprints

Now that you have designed your complete

ﬁngerprint ﬁle cards, you can compare them

against the prints that you already collected on the

ﬁndings card, and maybe even determine who they

belong to.

The ﬂat method records as

much of the ﬁnger as possible.

This can be useful to verify

rolling method ﬁngerprints.

All over our bodies, our skin is covered with glands

and pores — including on the ﬁngers. These

glands give off sweat, which covers the surfaces

of the ﬁngers if there is enough of it. If we touch

something with our hands, we leave behind a print

of sweat. It has been determined that each one

of us has a completely unique pattern of ridges

on our ﬁngertips, and that this pattern doesn’t

change over the course of our lives. Even twins have

different ﬁngerprints. For this reason, ﬁngerprints

are often used for the conclusive identiﬁcation

of individuals. For example, the police can arrest

suspects on the basis of ﬁngerprints used as

evidence.

According to the “Henry Classiﬁcation System” used

by the FBI, there are eight different basic ﬁnger-

print types:

These days, a lot of companies use ﬁngerprint scans

to verify the identities of individuals who attempt to

log into computers.

1. When you are ﬁnished, you must be absolutely

sure to replace the lid on the ink pad, so it doesn’t

dry out.

2. Always be careful not to stain anything with the

powder or stamp pad ink.

3. Store your ﬁngerprint set where your younger

brothers or sisters cannot get them.

4. Always ﬁnish by washing your hands thoroughly.

1. Arch

5. Loop 6. Whorl 7. Double Loop 8. Mixed

2. Tented Arch 3. Left Loop 4. Right Loop

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