Spies used to come up with ingenious ways to pass information in secret.
Can you work out what this secret message says:
STNEGA MRET FLAH YRAURBEF NUF A EVAH
One way of hiding messages was writing in invisible ink. There are many simple ways of creating invisible ink using store cupboard ingredients! One example that I have tried in the past is lemon juice…click link for some other ingenious ways of concealing secret messages and have a go at making your own:
Challenge: Write a results table of the most/least effective
Be sure to take lots of photographs and annotate with the methods you used. Please note that some experiments will involve using heat of some kind - please ask an adult for permission when using any form of heat.