This document provides instructions for writing invisible messages using simple materials like paper and pencil without special ink. The method involves writing a message with pencil on one piece of wet paper, placing a dry paper on top, and peeling them apart to reveal the message imprinted on the wet paper. Once dry, the message disappears, but can be viewed again by dipping the paper in water and holding it up to light. An alternative method uses milk as the writing medium, which also renders the message invisible until heat is applied.

1. How to write a invisible message without any special ink.
Step 1:
2 pieces of paper which are the same size
A pencil and NOT a pen (You'll know why in a minute)
Water
A hairdryer or radiator
Step 2:
Get one of your pieces of paper and wet it.
Then get you dry piece and lay it on top of your wet one
Write out your message with your pencil
If you used a pen and the ink sank through you may as well just
write it out normally.
Step 3:
Now you peel the dry piece of paper of and the writing should
strangely show up on the wet one, if you can't make it out you
have done something wrong. Be careful as the wet piece of
paper is prone to tear.
You don't need the dry paper anymore so chuck it away. You
can then let our wet piece of paper dry naturally or use a
radiator on hairdryer
Step 4:
When your piece of paper is dry you shouldn't be able to see
any writing. To reveal the message dip it in water and hold it up
to the light.
Invisible ink using milk
1.Dip a paintbrush, toothpick or stick into
milk and write your message on paper. You'll
be able to see the damp message, but it will
disappear once the paper dries.
2.Reveal the invisible message by holding
the paper over a lit light bulb or other heat
source
How It Works
The substances in milk weaken the paper
and also may be more susceptible to heat
than the paper, so although the message
dries clear, the paper weakens and darkens
where the milk was applied.