ขอมูลทั้งหมดนี้ขอขอบคุณ อาจารย์อวยชัย สุภาพจน์ To Shine a stone with sandpaper, begin by getting rid of any aspects of the rock you don't need with a hammer or chisel. Then, use 50 grade sandpaper to carry on shaping the stone on your liking. When you're satisfied with the shape, use one hundred Successfully Submitted (Awaiting Approval)