100 Days of Science #53-- Iodine and Starch Experiments

We still had lots of iodine left after our color changing experiment and decided to test our foods for starch.  

Iodine will react with the starches in foods and turn black. 

First we decided on a few foods to test.  We used cooked ride, a small red potato, some lettuce, granulated sugar, bread, and an apple. 

We cut/ diced our foods and made sure to keep them separate from one another.  We also cleaned the knife between foods so we didn't cross contaminate. 

The potatoes are sliced in the middle and the apple is diced on the side.

Then one by one we began dropping just a few drops of iodine on each of our food samples.

The lettuce, apple, and sugar had no reactions.

While the potato, rice, and bread did.

My boys immediately began brainstorming ideas about what other foods we could use in this experiment!

I just love quick and easy science experiments like this.

Others in this series:
2.  Field Trip to the Ecotarium 
3.  Learning About Air Molecules


  1. Very cool, we always loved working with iodine. Hope you have a great Monday!


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