I have several pounds of mercury that I bought from a very old dentist. He use to mix his own amalgam fillings in a machine that held the silver metal fillings in one chamber and mercury in the other. They would drop into a mixing chamber and shaken to mix. You could adjust the ratio to extend working time or make the fillings stronger or expand slightly to seal the cavity well in undercuts. I think I paid a buck or two for what I have. Haven't thrown it away because.... well it is mercury and not something to be disposed of improperly. Might be interesting to use it to get the lead out.
