Polishing and brightening is an application made for smoothing the surface with the process known as etching.
Burrs and particles on the metal surface are cleaned with harder particles than that metal. Brightening is the process of making the surface have a smooth appearence as in the mirror, after the polishing process is completed. This is the final process of polishing.
Brightening is carried out with the heat and pressure applied by the flexible wheels coated with very good abrasive. There is no abrasive powder in the brightening process.