Base metal Copper is also considered a base metal because it oxidizes relatively easily, although it does not react with HCl. In mining and economics, the term base metals refers to industrial non-ferrous metals excluding precious metals. These include copper, lead, nickel and zinc. The U.S. Customs and Border Protection is more inclusive in its definition. It includes, in addition to the four above, iron and steel, aluminium, tin, tungsten, molybdenum, tantalum, cobalt, bismuth, cadmium, titanium, zirconium, antimony, manganese, beryllium, chromium, germanium, vanadium, gallium, hafnium, indium, niobium, rhenium and thallium, and their alloys. Zamak is an alloy used in casting (metalworking) which
Nth metal mineral causes whatever is irradiated with it to float and defy gravity, like in the comics. The Nth Element is used in Hawkman's equipment, and Black Mask attempts to use it for a bank heist. In "", Batman uses Nth metal brass knuckles, handcuffs, as well as batarangs, to fight and capture Gentleman Ghost. Green Arrow is shown to have Nth metal tipped arrows. As shown in the animated "Justice League", Nth metal can be used against supernatural beings, but is vulnerable to direct magical spells, as is seen when Equinox mystically melts Batman's Nth metal handcuffs. In "The Flash"