We did a Science experiment and tested for starch. This sweet potato has starch--I know because when I put iodine on it, it turned purple. We tested other things, too. We also wrote secret messages with lemon juice and let it dry. Then we painted the paper with iodine and our messages showed up. The paper has starch in it. The next morning, I put iodine on a Ritz cracker and I learned that it has starch, too, because it turned purple!
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