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Most Recent Articles
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- Using Invisible Ink
In our wildest spy fantasies, in addition to the any number of ruses employed by undercover agents, is the use of invisible ink to communicate covert messages in plain sight of the enemy. But while our part in the drama may be fantasy, the use of invisible ink – in a variety of forms – is very real; its uses ranging from the commonplace to the extraordinary.
Invisible ink is used within the confines of any ordinary writing device. The message is written on ordinary paper; once the ink dries it is no longer visible to the naked eye. The method used to make the message visible again depends on the type of invisible ink used at the start. These methods fall into several generally accepted varieties:
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