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Gary Bouton asks an interesting question in his signature.
How do you tell when you've run out of invisible ink?
Attachment 85250
My answer is: You rub Lemon juice where you want to check, and if it's blank, then you've run out of invisible ink!
What's your answer?
For some invisible inks if you hold the paper to a heat source such as a light bulb the ink will turn brown same as happens with lemon juice.
So if you use lemon juice as an invisible ink how would you test that?
answer: heat.
Doesn't Gary mean the invisible ink in the bottle? ;):D
Maybe but what fun is that?Quote:
Originally Posted by neodeist
If it is what Gary meant then a method to tell could be devised. Same fun only finding the ink not the writing :D
After all, if you write the message without testing whether the invisible ink is in the bottle how do you check it? Your methods are correct but you'd have to write the message again ... and then the secret police would have got you
You just have to weigh the ink bottle, or shake it to hear or feel the ink slosh! After all, how did you know it had any ink when you bought it.
Mike
What if someone replaces your invisible ink with invisible water? :confused:
Oh great, first Mr Attachment 85270Quote:
Originally Posted by neodeist
But James took care of him Attachment 85271
Now the secret police. Sheesh!
A float should be an accurate indicator of any fluid in the bottle invisible or not but that wouldn't answer the question of what kind of fluid.
How about something like a litmus paper to test what kind of fluid.
This might be something for a challenge to design an invisible ink detector.
The question: How do you tell when you've run out of invisible ink?
The answer: It will appear.
Would it? If it were gone then how could it appear?Quote:
Originally Posted by Mike Bailey
Unfortunately we can't get
Mr.Attachment 85354
after you because James locked him up. Lucky you.