Anode mud is an insoluble substance or mixture that collects at the anode in an electrolytic refining or plating process. It is produced while purifying a metal through the process of electrolysis. In this process, impure metal is taken on the anode, and pure metal is taken over the cathode. When electricity is passed, the pure metal present in the anode goes and sticks to the pure metal at the cathode, and the impurities which were left behind settle down the anode, forming anode mud. Anode mud is a type of deposit that is insoluble in nature and is found in commercial electrolysis as a residue in the anode. It is also known as anode slime. Every year around 800,000 tons of anode mud is produced for purifying silver and gold metals. Impurities collected at the anode during electrolysis during metal purification are referred to as anode mud.