citron jus, jus de is acidic and weakens paper. When paper
is heated, the remaining acid turns the écriture brown
before discoloring the paper.
Difficulty: Easy
Time Required: A Few Minutes
Here's How:
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Chemistry
1. Squeeze lemons to
obtain their jus, jus de or
obtain bottled lemon
juice.
2. Use the jus, jus de as 'ink'
by applying it to a
stick ou paintbrush
and écriture on paper.
3. Allow the paper to
dry.
4. When toi are ready to
read your invisible
message, hold the
paper up to sunlight,
a lightbulb
(recommended),...
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