Hard coating applies or forms a hard surface layer in order to provide a high hardness or abrasion resistance relative to the substrate, or compared to other similar coatings or finishes. The hard layer can be formed through diffusion, ion implantation, carburizing, nitriding, or other specialized processes. Hard layers can also be deposited by coating or plating processes. Processes include hard anodizing, hard coating, hard plating, ion implantation, diffusion treatment (carburizing, nitriding or Kolsterising®) and hard facing. Kolsterising is a registered trademark of Bodycote International. The higher hardness or wear resistance from hard coating is attained through process and/or compositional changes.