I was electrolysing water with a 12v DC power supply at about 3 milliamps, using copper wire for both my anode and cathode. The solution was about 17 grams of table salt in 750 milliliters of purified water. After running the electrolysis cell for 1 minute, I left it overnight. The next day, I found a light blue powder at the bottom of the cell, which was still full of solution. Could this be copper hydroxide? If not, what could it be?
I should also note that the anode and cathode had become red, similar to what iron oxide looks like.