CNC Engraving is probably the first thing you think of when hearing of an engraving company: with the use of a fast turning mill the top layer of a material is taken away, so that it creates a deepened level. In order to create contrast often 2 color materials are used: a black plastic plate with a yellow top layer, will be a yellow plate with black lettering after engraving.
Next to deepening the material, it can also be milled through. For instance when an aluminum Front Panel needs a pattern of holes. In order to create contrast often 2 color materials are used: a black plastic plate with a yellow top layer, will be a yellow plate with black lettering after engraving.