(1) The most common of the special elements added to cast iron are nickel, chromium , copper and molybdenum.

(2) Common alloys used for this purpose include molybdenum and chromium in addition to manganese and carbon.

(3) Metal oxides such as chromium , iron, copper, or manganese, are used to colour glass, and the shades range from a light green to deep blue to topaz yellow.

(4) The metal can be, for example, titanium, tantalum, chromium , aluminium or tungsten.

(5) However, nickel alloys containing chromium , titanium and aluminum will form a thin oxide film.