You can make a really cool invisible ink using just a yellow highlighter and a lemon! Most yellow highlighters contain pyranine, which is a pH sensitive dye molecule. The citric acid in lemon juice causes the pyranine to change to a colorless form, making it ideal for an invisible ink. Developing the ink requires a base, and in this video I use a solution of sodium carbonate (washing soda), though baking soda may work as well (both are basic salts, but an equivalent solution of sodium carbonate
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