What finishing technique is employed to achieve a smooth high gloss on bare metal?

The finishing technique that is employed to achieve a smooth high gloss on bare metal is a polished finish. This technique involves the use of abrasive materials to refine the surface of the metal, which enhances its smoothness and shine. The polished finish reflects light exceptionally well, providing that desired high gloss appearance. This is particularly sought after in various applications, including decorative items, automotive parts, and jewelry.

In contrast, a brushed finish involves creating a textured surface with fine lines which gives a more subdued appearance rather than high gloss. A matte finish entails a surface that has no shine, resulting in a more understated look that diffuses light. A coated finish refers to applying a layer of paint or protective substance, which may not necessarily produce the reflective quality associated with high gloss metal. Therefore, the polished finish is distinctly the technique that achieves that smooth and luminous effect on bare metal.