At enough time of Hall's discovery, aluminum was an exceptionally costly steel. It sold for around $10 per pound—so scarce and was displayed at the 1855 Paris Exposition subsequent the French crown jewels. As a result of Hall's exploration, the price of aluminum dropped to below $.forty for each pound). https://aluminium-greenhouse56778.blogunteer.com/36245157/the-greatest-guide-to-sheds-and-garages