Who invented invisible ink, when and why?

Answer 1

The earliest reference to the use of a writing solution to be not visible whilst transported .. is found in the Papyrus of Ani (The book of the Dead) which specifically mentions using lime juice ... the message is then taken to the recipient covered (i.e. buried with the mummy) . upon exposure to sunlight the message becomes visible ..
the purpose of this instruction was to allow a plea to the Gods to only be seen in "their glorious radiance"

Answer 2

in case you could acquire a Calligraphy pen. college might have some, or ask around you would be shocked, older kinfolk could have an previous -Dip pen- the place you dip the nib in a pot (jar) of ink. Then get carry the two of a lemon, or a jar of lemon juice, there could properly be some interior the kitchen already. Use the lemon juice to write down a message on white paper. pass away it to dry. The message could disappear. Then gently heat the paper in front of a sparkling warmth source. The Hob on actual of your range could do, or a candle. you could see the message pass brown. And so be waiting to study it. playstation I even have purely remembered, in case you decrease the replenish a cotton bud at an attitude, it is going to do the interest of a nib for a pen. you will could basically write gently yet i think of that works.

Answer 3

www.wikipedia.org, you can try and find the answer there.

The exposition on invisible ink is one of those random facts that hardly anyone knows or cares about.

Answer 4

It is likely an ancient observation that transformed into secret communications.