นี่คือ หินน้ำมัน อเนกประสงค์รูปทรงหวี Should The scrape mark is gritty or white, the stone is too tender—it is possible to continue to polish it, but its physical appearance will likely not enhance. In the event the stone is still left with a metallic mark from the knife blade, it is difficult https://beediadiamond.com/catalog/polishing-stones