| Topic: QUESTION | |
|---|---|
|
How do you know when you’re running out of invisible ink?
|
|
|
|
|
When you can see what you are writing
|
|
|
|
|
|
|
|
|
|
|
LOL
|
|
|
|
|
|
You have to wear the "Special Glasses"! duh!
Didn't you see National Treasure?
|
|
|
|
|
|
. |
|
|
|
|
|
the pen gets lighter and the ink becomes visible
they put a little bit of normal ink in the top of the ink tank
|
|
|
|
|

