|The footprint demonstration is the messiest part of this mystery.|
Now, on to this week's clues...
|Paint the bottom of the shoe.|
|Step firmly onto a clean sheet of white paper.|
|You may not capture the entire print. That is okay.|
You can clean up everything now.
Once everything is dry, show your sleuths the samples from all the suspects. (There will not be one for the mystery man.) See if they can determine which prints are found at the crime scene. Have them check off the ones they find. Did they find the mystery man's prints? If they did reassure them that there was a set of prints not among the suspects and tell them that they may find out more about this suspect later. Did they find the right suspects? If not, do not fret. There will be plenty of clues that will point them in the right direction later.
The White Powders Test
|For this test, all you will need is two cups that contain corn starch and one that contains baking soda. You will also need a container of Iodine from the drug store.|
|Mark one of the corn starch cups...|
|and the baking soda cup with what they have in them.|
|Mark the second corn starch cup as the mystery powder.|
For this experiment/test, you will need some iodine from the drugstore and some items from your kitchen to test. How to conduct the Starch Testing can be found here. Once you are finished testing some items around the house, you can start the experiment for this part of the mystery. You will need two cups of about a teaspoon of cornstarch each and a third cup with about a teaspoon of baking soda. They should know just by its name that cornstarch contains starch, but have them test it anyway. They should see that the baking soda does not change the iodine's color but the cornstarch does.You student should correctly determine the identity of the mystery powder with ease. Can he figure out from the clues given in the story which suspects this points us to?