About 10 minutes ago, I was using my old playstation 2 power converter to perform electroysis on water. If I am correct, hydrogen is supposed to be formed at the cathode and hydrogen is colorless. However, when I started to see little bubbles rise the cathode which i assumed to be hydrogen, I could see a fade little gas rise from the water. I would like to know what this gas could be because I have heard that electrolysis can produce chlorine gas if you use table salt as an electrolyte. Also, oxygen is supposed to be formed on the anode but I think all of it is used to oxidize the metal anode. So how am I supposed to harness the oxygen?