Photo etching is the process of using ultra-violet light to fix an image onto a sheet of metal, and then using chemicals to etch the shape into the metal, removing more and more of the material until only the shape is left.
Creating a texture surface on a material by using compressed air to blast abrasive particles against it.
Spray etching is a surface treatment process in which ink containing controlled particle sizes is sprayed onto a mold surface using a spray gun, following a specific texture or pattern requirement.
Film etching is a surface texturing process where a photo film is precisely positioned and attached to the mold surface.