Invisible ink
Science Experiments Ideas
Invisible ink
If you ever want to write a secret message on paper, simply use
vinegar, lemon, or onion juice, as the invisible ink. Write with it
as usual on white writing paper. After it dries the writing is
invisible. The person who receives the letter must know that the
paper has to be held over a candle flame the writing turns brown
and is clearly visible.
Vinegar, and lemon or onion juice, cause a chemical change in the paper to a sub stance similar to
cellophane. Because its ignition temperature is lower than that of the paper, the parts written on
singe.
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