Electrolysis of ferric chloride
This is purely an experiment, as it's hard to find clear videos like this. It's not very suitable for practical use due to its length.
I initially added 3 spoons of salt and added more during the electrolysis process, increasing the amount of salt to 8 spoons in each jar.
The electrolysis process lasted about 100 hours. I changed the gauze with the strong salt solution in the tube twice a day, as the salt hardened and the tube began to heat up due to the high resistance to current. The piece of PCB etched for about three days.
During the electrolysis and etching, I occasionally shook and stirred the solution.
P.S. Ferric chloride is iron chloride.