How do you tell when your out of invisible ink???

United States
July 8, 2009 7:44am CST
This is another question that will really make you think, but it is true how the heck would you know when you are out of invisible ink, please respond with a good answer. thanks.
1 response
• Philippines
8 Jul 09
Well...I usually check if what I write on my invisible paper can still be read. If nobody can read it then I guess I'm out. But I really don't worry so much, because I have lots of invisible pens.