I believe it's called hydrofilm...it's a process where the type of camo pattern you want to put on anything, is transferred from "sheet" material to water,it sits on top of the water and then whatever you are are coating is submersed into the camo pattern and water...you can do darn near every pice on a firearm as this process gets into every little nook and cranny it can...supposed to be very durable as well...I'm not sure if it uses electricity,but if it does,you could describe it almost as a chrome plating process would be done...or similar idea anyway