April 2012 Entries

The American Greenback

The American “greenback,” probably the most famous paper currency in the world, owes its vibrant hue to a Canadian discovery. The “green” is chromium oxide, a refined version of chromite, a naturally occurring ore in the Earth’s crust. This ore is also the source of chromium metal which is produced by heating the ore in the presence of silicon and aluminum. The metal derives its name from the Greek “chroma” meaning colour [To read more click on Title.]