What other liquids or solutions can you use to write secret messages? We have tried writing secret messages with a baking solution on marshmallows and it worked like magic. Other fruits such as banana, pear, and avocado also darken when you leave them out too long after you cut them. This is similar to what we have seen in the apple oxidation experiment. When carbon came into contact with air, it turned brown as the result of oxidation. The added heat caused some of the chemical bonds to break down, releasing the carbon. When you painted lemon juice onto paper, the carbon-based compounds got absorbed into the paper’s fibers. The Science Behind the Invisible Lemon Ink But my kids are very careful and I was monitoring them carefully with a glass of water in my hand. Don’t be alarmed, I know I am letting my kids near an open flame. We ended up trying both the candles and the iron. Whatever heat source you decide to use, just use good judgment and a lot of caution. You can turn on the stovetop and hold your paper over the hot burner. A heat lamp or light bulb can emit enough heat to reveal the secret message.
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