Brain Teasers
Brain Teasers Trivia Mentalrobics Games Community
Personal Links
Submit a Teaser
Your Favorites
Your Watchlist
Browse Teasers
All

Cryptography
Group
Language
Letter-Equations
Logic
Logic-Grid
Math
Mystery
Optical-Illusions
Other
Probability
Rebus
Riddle
Science
Series
Situation
Trick
Trivia

Random
Daily Teasers
Search Teasers

Advanced Search
Add to Google Add to del.icio.us

More ways to get Braingle...

Invisible Ink

Science brain teasers require understanding of the physical or biological world and the laws that govern it.

 

Puzzle ID:#9525
Fun:*** (2.36)
Difficulty:** (1.15)
Category:Science
Submitted By:alintanfern
Corrected By:Dave

 

 

 



There are two secret agents who want to send letters to one another but think that someone might try to read them. The first agent came up with an idea to send a letter to the other agent by writing with invisible ink. He then put the letter in his mailbox for delivery. When the other agent received the letter, he opened it and began to read its contents. How was it possible for the first agent to write with invisible ink and how was the other agent able to read it?




What Next?

  
  

See another brain teaser just like this one...

Or, just get a random brain teaser

If you become a registered user you can vote on this brain teaser, keep track of
which ones you have seen, and even make your own.

 






Back to Top
   



Users in Chat : dangerouspie101 

Online Now: 13 users and 493 guests

Copyright © 1999-2014 | Updates | FAQ | RSS | Widgets | Links | Green | Subscribe | Contact | Privacy | Conditions | Advertise

Custom Search





Sign In A Create a free account