Have you ever wanted to draw a picture that only you knew what it was because it disappeared? We did just that! We painted in lemon juice, let it dry, and finally watched as our pictures magically appeared after a trip to the oven. This experiment taught us about evaporation. As the lemon juice was heated, water evaporated away. The compounds that remained combined with oxygen and turned the juice brown. (Katie chose to paint a Christmas tree!)
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