[سامية الحرف]

Invisible Ink with LemonJuice


Making invisible ink is a lot of fun, you can pretend you are asecret agent as you keep all your secret codes and messages hidden from others. All you need is some basic household objects and the hidden power of lemonjuice.



What you'll need

• Half a lemon
  
  
• Water
• Spoon
• Bowl
• Cotton bud
• White paper
• Lamp or other light bulb

Instructions

:


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

Mix the water and lemon juice with the spoon.

Dip the cotton bud into the mixture and write a message onto the whitepaper.



Wait for the juice to dry so it becomes completely invisible.



When you are ready to read your secret message or show it to someone else, heat the paper by holding it close to a light bulb
.


What's happening?


Lemon juice is an organic substance that oxidizes and turns brownwhen heated. Diluting the lemon juice in water makes it very hard to notice whenyou apply it the paper, no one will be aware of its presence until it is heatedand the secret message is revealed. Other substances which work in the same wayinclude orange juice, honey, milk, onion juice, vinegar and wine. Invisible inkcan also be made using chemical reactions or by viewing certain liquids underultraviolet (UV) light.