Chromium is named from the Greek chroma, color and was discovered in 1797. Chromium is a steel gray, lustrous hard metal that takes a high polish. The principal ore is chromite and is found in Zimbabwe, Russia, Turkey, Iran, Albania, Finland, Madagascar and the Philippines. The metal is usually produced by reducing the oxide with aluminum. Chromium is used to harden steel, to manufacture stainless steel and to form many useful alloys. Much is used in plating to produce a hard, beautiful surface and to prevent corrosion.