Invisible Ink

One of the best ways to send a secret message
is to write it in invisible ink. There are several
types of invisible ink.

Lemon Juice Ink: Squeeze the juice of half
a lemon into a small dish. Orange juice
and grapefruit juice can also be used. Use a
toothpick and write with it like ink.

Sugar Water Ink: Put half a teaspoon of sugar
into a half a glass of water and stir until the
sugar is completely dissolved.

Honey Water Ink: Put half a teaspoon of
honey into half a glass of water and stir until
the honey is dissolved and the water is clear.

Onion Juice Ink: Peel a small onion. Grate
in into a pulp and let the pulp stand in a small
dish. After several minutes you will see that
part of the pulp has become liquid. It sinks,
but this liquid makes excellent invisible ink.

Combination Ink: Slice a piece off the end of
the onion and the lemon and squeeze out the
juice (you will need about 4 drops of each) into
a small bowl or jar lid and about 17 grains of
sugar and stir with a toothpick until dissolved.
Write with the toothpick.

To reveal your message hold the paper
carefully over a light bulb until the message
appears.