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How to make invisible ink with baking soda
Mix baking soda and water.
Making a solution suitable for invisible ink will take almost equal parts baking soda and water. For the best results, you want to mix as much baking soda as you can into a small bowl of water.
Add a little baking soda at a time and mix slowly to fully saturate the water. 1/4 cup (60 ml) of water will hold 3 tablespoons (43.2 grams) of baking soda.