12/3/2023 0 Comments Lemon juice ink![]() And yet it DOES happen when you put it on a hot lamp. It delays the oxidation process in fruits and prevents them from turning brown. ![]() if that's true, it would happen on an open flame and not, say, heating by lamp. Cool Invisible Ink Experiment with Lemon Juice Learn how to write secret messages with invisible ink Using commonly found household items such as lemon juice, your kids can send secret messages to friends and family. Squeeze a bit of lemon juice and a few drops of water into a bowl to DIY your own invisible ink Use a paint brush or cotton ball to write messages on. I am skeptical of this explanation, it sounds weird to me. I keep reading the explanation that the lemon juice "weakens the paper" and when you heat it up the previously lemon'ed parts burn faster (hence turning brown). I want to explain WHY this happens, and I can't find any good resources. You wait for it to dry up, then when you're ready to read it, you heat it up. cup baking soda cup water Grape Juice Paper Something to write with- a cotton swab, toothpick, or paintbrush all work well. I'm trying to write-up an activity sheet about the "invisible ink" experiment with lemon juice.įor those who are not familiar with this - you take lemon juice and use it as ink to write a "secret message" on a piece of paper.
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