66953_Prof CHEM INS_Cover(6L) - Imaginarium
66953_Prof CHEM INS_Cover(6L) - Imaginarium
66953_Prof CHEM INS_Cover(6L) - Imaginarium
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SECRET MESSAGES<br />
You can write secret messages on many different materials using invisible ink made with<br />
lemon or crystals.<br />
To make invisible lemon ink, you will need:<br />
• A lemon<br />
• A paintbrush<br />
• A sheet of paper<br />
• A beaker<br />
• A candle<br />
Squeeze the lemon and pour the juice into the beaker. Use the brush to write a message<br />
with the lemon juice on the sheet of paper and let it dry.<br />
With the help of a grown-up, move the paper over the candle flame slowly until the message<br />
appears. Don't try to do this on your own! Don't forget to blow the candle out once you have<br />
finished the experiment; do not move the lit candle; keep it away from flammable material;<br />
out of the reach of small children and pets. Always use a stable, heat-resistant surface.<br />
You can also reveal the secret lemon ink message by submerging the paper in black tea:<br />
• Strong black tea<br />
• A lemon<br />
• A paintbrush<br />
• A piece of paper<br />
• A beaker<br />
• A measuring spoon<br />
• A dropper<br />
• A bowl<br />
Half-fill the bowl with water. Place 10 drops of strong black tea using the dropper and stir.<br />
Squeeze the lemon and pour the juice into the beaker. Cut out a piece of paper to fit inside<br />
the bowl and write a message using the brush and the lemon juice ink. Let it dry and... The<br />
message will become invisible!<br />
To reveal the message, place the paper inside the bowl so it is covered in black tea. Wait a<br />
few minutes and... What happens? The invisible message!<br />
SALT STALACTITES<br />
Prepare the following material:<br />
• Salt<br />
• A magnifying glass<br />
• 2 plastic or glass tumblers<br />
• 4 strands of wool, each about 30cm long<br />
• Warm water<br />
• A plate<br />
Twist the strands of wool together to make a thick cord. Fill the two containers with warm<br />
water and add lots of salt. Keep adding salt until no more will dissolve. Place the plate<br />
between the two tumblers and insert one end of the woollen cord into each one, letting the<br />
middle part of the cord hang over the plate.<br />
After a few days, you will notice salt stalactites have formed along the cord. You can see<br />
them in greater detail using your magnifying glass.<br />
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