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METHODS OF MANUFACTURING INVISIBLE INK
A means of making secret ink that can be used to “fasten” solemn persuasion: take a sprig of willow, burn it into coal, then finely grind it or rub it with water on the stove on which painters rub their paints. Then dilute it with water so that the ink is able to scribble on a sheet of paper.
Letters written with such ink will also disappear after six days.
The way is different. It is necessary to mix 50 ml of spirit tincture of iodine with a teaspoon of dextrin and filter the sludge. Such blue ink completely loses its paint in 1-2 days due to evaporation of iodine.
The recipe for this ink is simple, as if everything is ingenious. Invisible ink is a saturated solution of ordinary drinking soda in water. They are extremely cheap and can be stored for a very long time without spoiling. This is their advantage in the way that is known to many - the message of milk. for convenience of the message with this ink it is the best of all to fill a pen. At the same time, after the feather, the water evaporates, and there seems to be nothing on the sheet of paper either. The secret message also manifests itself quite simply: by counteracting heat. When heated, a dark brown text appears. You can carefully show the text over the fire or electric stove, but it is also better safer to use the iron. The most adapted variation is a small-sized marching iron.