Graphite Crucible Cup with Lid 1.5" x 1.5" High Density For Melting Gold Silver Copper Smelting 1.5" x 1.5" Graphite Crucible with Lid Made from High Density Graphite This crucible can be used with Silver, Copper, Aluminum, Brass and other metals. This crucible is to be used within a electric furnace or by a propane torch method of melting only. Not to be used in a coal furnace.