Inkjet salt water mix and develop with silver nitrate
I learned that invisible ink technology was using above mentioned chemistry and Fox Talbot had been invented a similar chemical technology.
Before making negatives from expensive inks and than before using complicated chemistry , this one could be cheap answer.
Does it work ?
Mustafa Umut Sarac
This sounds interesting. Could you please link to/or cite where you got this from? That would make researching this easier.
Its called salt print.
With above link , you will have an idea.
I was researching Da Vinci drawing tools , Sanquine crayon , Conte Crayon and milk , beer , coal powder dried pressed mixed crayons and I reached to invisible ink technology.
There is told above.