polishing stones with cerium oxide - An Overview
คุกกี้เพื่อการโฆษณา คุกกี้เพื่อการโฆษณาIf the scrape mark is gritty or white, the stone is just too soft—you may continue to polish it, but its overall look will never enhance. When the stone is still left with a metallic mark from the knife blade, it is hard adequate to