Today I got the brilliant idea to make my own sodium hydroxide. I put some water in a glass jar, threw in some salt, connected each electrode to a terminal on a 12V DC motorcycle battery, and away the reaction went. My assumption was that the metal breaking apart at the positive electrode would go to the negative electrode, and my solution will stay fairly clean. My assumption couldn't have been more wrong. Right now the solution is opaque, sort of blue/black in color, and has little chunks of stuff floating around that sort of look like curdled milk. The anode is a crappy bottle opener from the 1970s, and the cathode is just a wire with about 2 inches of plastic removed from the end. What is this garbage? How can I make sodium hydroxide solution that is transparent?