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Making disappearing ink requires some chemical compounds that may not be readily available at home. Making blue disappearing ink requires .10 grams of thymolphtalein, 10 milliliters of ethyl alcohol, 90 milliliters of water, and 20 drops of 3M sodium hydroxide (or 10 drops of 6M sodium hydroxide solution.) Start by dissolving the thymolphtalein in the ethyl alcohol. Then stir in the water. One drop at a time, add the sodium hydroxide until the solution turns dark blue. Store the ink in a sealed container until you want to use it.

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10y ago

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