Once the reaction is done, the solution should be colorless. Add 5 drops of 6 M HCl solution to dissolve any insoluble aluminum salts (handle with care, as it will cause painful burns if it comes into contact with skin). Use a glass stirring rod to scrap off as much copper as possible, then take the wire out of the solution with the stirring rod. Rinse the rest of the copper off with water, and if it doesn't come off, use one or two drops of the HCl solution. Place the Al wire aside.
