What is processing corundum

Corundum is generally polygonal shape diamond , so the colors are white , then in today's society, many people do not know what is corundum , but do not know what effect it has , generally used in the wrong ?
Corundum Scope:
Etching processing: jade, crystal , agate, semi-precious stones , stamps, ornamental stones , antiques, marble gravestone, ceramic, wood , bamboo , etc. etched art .
Pretreatment processing: PTFE (TEFLON), PU, ??rubber, plastic coated , rubber drum (ROLLER), electroplating, metal spray , titanium , etc. Before treatment, the increase in surface adhesion .
Beautification processing: various gold , K gold jewelry, precious metal or of extinction matte , crystal , glass, corrugated , acrylic, and other non-metallic matte processing and enables the workpiece surface into a metallic luster.
Surface processing: metal oxide layer, carbide black , metallic or non-metallic surface dirt rust removal , such as gravity die casting, rubber mold of the oxide or remove agents from the shape , ceramic surface black spots , uranium -color removal , painting rebirth.
Flash processing: bakelite , plastic, zinc, Alumina Refractory,aluminum die-casting products , electronic parts , core , etc. burr removal .
Stress relief processing: aerospace, defense, precision industrial Parts , rust, paint extinction , renovation etc. stress relieving processing.