Invisible Ink

So want to know how to make invisible ink?

Well you can either buy invisible ink from the shop or make it at your house using ingredients or materials which are there in your house.

Materials required:

1. Lemon or orange 

2. Few drops of water

3. A bowl to mix the lemon juice and water

4. A preheated iron or stove

5. A fountain pen

How to proceed

1. Take the lemon and squeeze it into the bowl and mix a couple of     droplets of water and mix them well.

2. Fill this solution ( that's the term used when something is dissolved in water) into a fountain pen.

3.Write the message on a sheet of paper and keep it for drying. 

4. Simultaneously switch on the iron and let it heat.

5. Now press the hot iron(press) on the sheet of paper and the message will come OR

6. keep the sheet above the flame by about 1 foot and let it get heated up, and after some time the message re-appears.

Reason 

The reason behind this is that the lemon juice is acidic and softens the paper. When heated the acid gets burnt faster resulting in the brown prints of your writing.