If you have a metal surface that has been worked with a hammer and anvil, you may have some forge marks on it. These are not permanent white spots in the metal, but instead they're raised areas of metal that have been struck repeatedly by a hammer. They can be removed by sanding them down or polishing them out as needed
If you need to remove forge marks from metalsmithing or blacksmithing projects, there are several different ways to do so. We'll discuss how to remove forge marks from metal using sandpaper and other methods.
how to get forge marks out of metal