Electrolyte is a chemical composition of various chemicals that allow the electrical current to pass through the stencil, making your mark. Different chemicals react differently to different metals. Therefore one solution cannot be used on varying metals with good results.

Can you make your own?
Probably, if you could determine the proper balance of chemicals for your metal and had the resources to obtain them all. I have not tried to figure them out because frankly the stuff is not that expensive for the length of time it lasts. I look at other places to save cash that can save me more in the long run.


Here is a chart showing what electrolyte to use for what steel from IMG. They may be willing to share the chemical breakdown if you ask but I would be surprised if they did. After all, it is their bread and butter.
IMG's Electrolyte reference table