Disappearing ink was our most recent experiment. We used phenolphthalein, ethanol, distilled water, and sodium hydroxide. We started by mixing a little phenolphthalein and 10 ml of ethanol in a flask. Next we added the distilled water. When we did this we saw a chemical reaction happen, it changed colors. Andrew came around and added a few drops of sodium hydroxide. This made the mixture change to a dark red. When we would take a little out and put it on paper you would slowly see it disappear as it dried. This works because when the hydrogen ions that were created are exposed it turns the ink to invisible.
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December 2016
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