mirror reflection Mechanical mirror polishing is to polish (rough grinding, fine grinding) metal materials to achieve a smooth and bright mirror effect. Mirror polishing can be divided into mechanical mirror polishing and chemical solution mirror polishing. Usually used for polishing stainless steel. Sometimes used to polish cast aluminum. Chemical solution mirror polishing is to use chemical solution to remove surface oxide skin to achieve brightening effect. Mirror polish depends on the finish. Directly understood as smooth as a mirror, below Ra0.2, etc. https://www.investmentcastingpci.com/blog/how-to-mirror-polish-stainless-steel/