chanh nước ép, nước trái cây is acidic and weakens paper. When paper
is heated, the remaining acid turns the nghề viết văn 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 nước ép, nước trái cây or
obtain bottled lemon
juice.
2. Use the nước ép, nước trái cây as 'ink'
by applying it to a
stick hoặc paintbrush
and nghề viết văn on paper.
3. Allow the paper to
dry.
4. When bạn are ready to
read your invisible
message, hold the
paper up to sunlight,
a lightbulb
(recommended),...
continue reading...