INVISIBLE LINK

 Invisible Ink is any substance that you can use to write a message that is invisible until the link is revealed. You write your message with the ink using a cotton swab, dampened finger, fountain pen, or toothpick.Oncw dry, the written surface looks as if it were blank.The ink can be later made visible by different methods.Invisible ink is also known as security ink or sympathetic ink. 

 There are also a toy invisible ink pens which is used by children for playing. It has two tip one for  invisible ink writing and another for developing the ink. 

There are specialty security maker pens formulated for writing on non - purpous surface such as glass, plastic, metal etc. The mark can be read by using a blacklight or other UV light source. 

It is a very interesting and fabolous. 

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