Anodising: An acid based process where an electrical current is passed between an anode and a diode while the parts are suspended in a sulphuric acid solution, can only be used on Aluminium parts however. This process is basically reproducing an oxidisation process. Two basic types of processes can be offered by Allt Solutions, a decorative process with a coating thickness of about 10 microns. This is a thin coat and is best used for decorative in door products that are not subject to wear. The second process is hard anodising with a process thickness of 25 microns, very hard and is often used in the marine environment. A dying process can also be used that gives very good cosmetic finishes in a variety of different colours.