Q:

How do you know when you run out of invisible ink

Answer

How do you know when you run out of invisible ink? Great question! It's been said that the ink at the end becomes visible! ChaCha!

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More ChaCha Answers (1)

Well that is a very good question. Try shaking the bottle to hear the liquid inside. If you hear nothing, you ran out! ChaCha on.

Jan 07 2009, 07:19pm | Source: When do you know if you've ruhn out of invisible ink? - Yahoo! Answers | answers.yahoo.com
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