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Showing results 1 to 15 of 15
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Invisible Ink Demonstration
Source Institutions
In this chemistry demonstration, learners will discover that phenolphthalein is a chemical that displays different colors depending on the acidity or basicity of the environment.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-001-183.jpg?itok=qNqna_l_)
Fingerprint Identification
Source Institutions
In this crime science activity (on page 2 of the PDF), learners will explore the uniqueness of fingerprints. The will learn components of fingerprints as well as why fingerprints are left behind.
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Separating with Chromatography
Source Institutions
In this experiment, learners separate different types of molecules in marker inks (using a technique called "thin layer chromatography").
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-004-306.png?itok=m8djA0pV)
Chromatography
Source Institutions
In this activity, explore chromatography and the various colors that make up the ink in markers. Use this activity to investigate cohesion and adhesion.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-000-743.jpg?itok=h2057ZkK)
Setting the Scene
Source Institutions
In this activity (on page 2), pairs of learners create an imaginary crime scene. One person leaves the room while the other person moves a few things around.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-004-282.png?itok=lDVIDK6v)
Mirror Messages
Source Institutions
In this activity, learners use mirrors to write secret messages to a friend. Use this activity to explore letters, optics, and/or symmetry.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-004-292.png?itok=RXlaKz-t)
Fingerprints
Source Institutions
In this activity, learners examine their fingerprints and learn that they can be categorized by shape, but each fingerprint is unique.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-002-201.png?itok=hbjQM15I)
Whodunit?
Source Institutions
In this fascinating and fun experiment, learners use chemistry to identify a mystery powder and to solve a "crime," a process similar to that used by real forensic scientists.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-002-221.png?itok=VVjN9waf)
Operation Espionage
Source Institutions
In this activity, learners create and reveal secret messages written with invisible ink! The invisible ink is actually a baking soda solution, and the magical revealing liquid is fruit juice.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-004-612.png?itok=EkArGzwt)
Secret Goldenrod Messages
Source Institutions
In this activity, learners write invisible messages on goldenrod paper, and make the message appear and disappear using acids and bases.
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Fingerprint Identification
Source Institutions
In this activity (on page 2) about fingerprint analysis, learners use graphite from a pencil and scotch tape to capture their fingerprints.
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Identify Your Fingerprints
Source Institutions
Learners roll their fingerpads in ink pads, and then press their fingerprints onto balloons. Learners inflate the balloons to produce enlarged versions of their fingerprints.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-004-294.png?itok=juOgmbpU)
Periscope
Source Institutions
In this optics activity, learners build a spy tool to secretly view things over walls or around corners.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-004-281.png?itok=XYfbgMtv)
Scytale Messages
Source Institutions
In this activity, learners use a soda can to decode a secret message. Learners wrap scytale (pronounced ski-tally) code around a can and challenge friends to see if they can crack the codes.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-001-298.jpg?itok=9ec61Ekt)
Plaster Casts
Source Institutions
In this activity, learners combine two substances (plaster of Paris and water) to make a cast of an object's imprint in clay.