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Secret Agent Invisible Ink

by Jane (follow)
5 to 10s (616)      Over 10s (384)      Medium (247)      Science (26)      Magic (11)      Pirate (11)      Treasure map (2)      Invisible Ink (1)      Secret (1)     

invisible ink secret agent spy treasure map

Make your own invisible ink and watch your invisible creation re-appear again when heated, as if by magic. Be a secret agent for the day and write top secret messages to friends or create an 'invisible' treasure map.

Warning: the paper can get very hot so adult supervision is needed.

Time: 30 minutes
Age: 5-10's, Over 10's
Level: Medium

Few drops water
Nib to write with - try a blunt wooden skewer, cotton bud or even the hard tip of a feather
Toaster and tongs to reveal your message

invisible ink secret agent spy treasure map

Squeeze the lemon juice into a bowl and add a few drops of water

invisible ink secret agent spy treasure map

Dip your nib into the 'ink' and write your secret message on a piece of paper, dipping more 'ink' onto the nib as often as you need.

invisible ink secret agent spy treasure map
We had fun using the hard tip of a feather for our nib

Leave the paper to dry. Your 'ink' should dry clear so that your drawing or message becomes invisible.

invisible ink secret agent spy treasure map
Ink drying on the paper

You could choose to add some 'decoy' writing with a ballpoint pen on your invisible ink paper.
When you want to reveal your secret message, hold the paper over the top of a toaster switched on for a few minutes. The paper can get very hot so be sure to use tongs
The lemon juice will turn brown and your invisible message will appear as if by magic!

invisible ink secret agent spy treasure map
Hold the paper over a toaster using tongs

invisible ink secret agent spy treasure map
Watch your message magically appear

You could also tear round the edges of a sheet of paper and make a secret treasure map.

invisible ink secret agent spy treasure map
Invisible treasure map

Younger children can also enjoy just painting with the 'ink' and watching their artwork disappear and re-appear again, as if by magic.

invisible ink secret agent spy treasure map
Younger children will enjoy watching their drawings magically re-appear

#5 to 10s
#Over 10s
#Treasure map
#Invisible Ink
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