Anodized Aluminum engraving is a form tags or identification plates can be laser or rotary engraved. This solid sheet of aluminum has an anodized surface. The anodization colors the actual metal to a depth of .001″ to .002″ and is typically more durable then a paint that is applied to the surface of the metal. For this reason, anodized aluminum engraving is often used for industrial applications requiring a durable surface finish.