How to Make Homemade Spy Stuff

Invisible Ink

• 1

  Dip a toothpick or cotton swab into lemon juice, and write a message on a piece of paper. Pure white paper may show the dried lemon juice so choose an off-white or cream-colored paper. Allow the juice to dry, and your message will vanish.

• 2

  Disguise your hidden message by writing a misleading note or drawing a picture on the piece of paper. This will distract other people from finding your original message.

• 3

  Heat the paper with a blow dryer on a warm setting or by holding it over a candle. The lemon juice will darken, and the hidden message will reappear.

Book Safe

• 4

  Find a thick older book you don't mind defacing. You can find a book at a used bookstore or thrift store if you do not have one that you can cut up at home.

• 5

  Open the book about a third of the way. Cut a hole in the pages of the book, hollowing out the center and leaving a 1-inch border around the edges. Do not cut through to the back cover of the book; leave at least a half-inch thickness of uncut pages.

• 6

  Hide your secret items in the hole in the book. You can then leave the book on a bookshelf at home to hide important items or use it pass messages.

Ballpoint Pen Message Compartment

• 7

  Write a message on a small strip of paper about a half-inch wide. You can encode the message in case it is intercepted.

• 8

  Disassemble a ballpoint pen, and wrap the message around the ink cartridge in the pen.

• 9

  Reassemble the pen, and use it to pass information to your contact. This is a great way to pass notes in school or on the street.