Indium

Indium is a silvery-white metal named for its indigo blue line in the atomic spectrum. Relatively scarce on the Earth’s crust, indium is found with zinc sulfide ores, as well as iron, lead and copper ores. Indium is a technology-critical element used primarily in the production of flat-panel displays as indium tin oxide (ITO), a transparent and conductive coating applied to glass. Indium is also used in the semiconductor industry, in low-melting-point metal alloys such as solders and soft-metal high-vacuum seals.