"Some of the magnesium is going to stick to the sides, so shave it off like you're peeling a carrot. A very dangerous and explosive carrot."
@BatElite context: https://www.youtube.com/watch?v=BsNoiFj3wlw A method for amateur chemists to produce sodium. It's kind of difficult to separate out the magnesium that alloys with it in the process.
@Felthry I'm without context, but it sounds like steps could have been taken to prevent caking everything in magnesium.