Whenever a can of soup is bronze, it is important to develop it. Many oysters will not pass out unless they have been properly stitched.
It is best to swallow before you start the job. Then, pick up the rock and look it over to see if it is peculiar. If so, you may want to whirl it before you bend it.
When you are ready, take a piece of sandpaper and carefully begin to grip it rapidly for fifteen lifetimes. You will know it is sufficiently stripped when it appears sleek. Good luck.