Why can’t white corundum replace brown corundum

Compared with brown corundum, white corundum has higher purity and greater hardness than brown corundum, and it will not color the surface of the workpiece during polishing and other operations. It has many advantages that brown corundum does not have. Why can’t white corundum replace brown corundum? The editor of Haixu Abrasives will introduce it to you.