This is a very cool experiment! It's a great one because the kids get to pick the food they would like to test for starch. The tip I have is that if you are needing to do this experiment and haven't really prepped ahead of time you don't have to do the control. The idea of the control is to compare the color or reaction the iodine has with starch to the foods you choose to test. In doing this experiment it became clear to me that the control was not necessary. When the iodine hits a food with starch it turns the deep purple almost black as expected and when the iodine hits food without starch the color is that yellow/orange iodine color. The reaction is very easy to tell and when you have to let the control dry, the waiting time can mean loosing the attention of any fourth grader. Prepping is good however it's not always workable in the course of our homeschool day. Hope this helps smooth out your day as well. Happy Experimenting!
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