1. Immediately label your print L or R for left or right hand and I or M for index or
2. Repeat procedure for the second finger. Do it over until you get two good prints.
3. After all prints are made and labeled, have partners in each group
If you want to use fingerprints to solve crimes, you must have a way to describe and sort and find
prints that are similar to the one you find at a crime scene.
The FBI has over 200 million prints on file; they cant look through every single one to find a
Fingerprinting: A Lesson on Classification
Can we invent a way to classify fingerprints?
Many areas of scientific study involve the collection of large amounts of data. Such data
must be organized in order to be useful.
Ridgeology: The study of the uniqueness of friction ridge structures and their use for personal
As we have learned in our first lesson, a fingerprint is made of a series of ridges and valleys on
the surface of the finger. The uniqueness o
Fingerprint Experiment and Identification
Blow up your balloon about halfway and twist the end to keep the air from coming out. Do
not tie it off!
2 Use an ink pad to make a print with all of your fingers and label each one with a permanent
The HenryFBI Classification
Each finger is given a point value
Assign the number of points for each finger that has a whorl and substitute into the equation:
There are no legal requirements in the United States on the number of points. Generally,
Ninhydrinreacts with amino acids to produce a purple color.
Silver nitratereacts with chloride to form silver chloride, a material which
turns gray when exposed to light.
Cyanoacrylatesuper glue fumes react with water and other fingerprint
Types of Prints:
Palmfriction ridges can be identified and may be used against suspects.
Footprints are taken at birth as a means of identification of infants.
Lipsdisplay several common patterns
Short vertical lines
Short horizontal lines