Invisible Writing

Materials:

Piece of Paper
Small Twig OR Cotton Bud
Milk
OR
Orange Juice
Apple Juice
Onion Juice
Soft dink
Cordial
Water
Heater OR Oven
Adult Helper

What You Have To Do:

Get a piece of paper and a twig or a cotton bud.
Put the end of the cotton bud or the twig in to a cup of milk or juice etc.
Draw or write something on it with the twig or the cotton bud and then put it in the sun or over an oven. (Adult help with the stove.)

What I Think Will Happen:

I think that when you put the piece of paper over the oven or in the sun, the liquid heats up and leaves marks on the paper before it evaporates.