Writing with Electricity
Electrolytic Writing
Soak a piece of white paper in a solution of potassium iodide and water for about a minute and then lay it on a piece of sheet metal. Connect the sheet metal with the negative or zinc side of a battery and then, using the positive wire as a pen, write your name or other inscription on the wet paper. The result will be brown lines on a white background.
Contributed by Geo. W. Fry, San Jose, Cal.