"Invisible link as an advertisement "

*Invisible link is known as security ink.

*We use this for secretive, sympethic and to secure our personal thoughts. 

*It's easy to use. 

*We can write as we can  use normal pen.

*The important and amazing part is no one can write either then ourself. 

*We can gave some special lights to see what we have written. 

*We put light on it and read what we have written. 

*In this, we make our thoughts private.