Invisible
Ink Pen
When
you want to send a spy report without the enemy reading it you write
in code. But if someone discovered the code, it will be pretty
suspicious. If you want to write something that the enemy will not
read, invisible ink is the way to go.
Invisible
ink has been used for almost a century. It was first used by the
Romans. It was made from milk
of the thithymallus plant. In the Revolutionary war, they used
sulfate and water to create invisible ink. Some wrote in lemon juice
or vinegar. Today we use invisible ink that can be read under a
blacklight.
Invisible ink is often written between the lines of letters, notes,
and even music sheets. But people are always thinking of new ways to
write with invisible ink. In world war I, a woman was discovered
carrying an invisible ink message on her back! Once, invisible in was
found written on the petals of a flower.
You
can make your own invisible ink too.
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