Nordic Gold

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50 euro cent coin made out of Nordic Gold.

Nordic Gold (Swedish: nordiskt guld[1]) is the gold-coloured copper alloy from which many coins are made. It had been in use for a number of coins in many currencies, most notably in euro 50, 20, and 10 cents, in the Swedish 5 and 10 kronor coins, the latter of which it was originally developed for, as well as the Polish 2 złote commemorative coins. Its composition is 89% copper, 5% aluminium, 5% zinc, and 1% tin.[2]

Being a copper alloy, it contains no gold. Its colour and weight are unlike pure gold. It is non-allergenic; its other advantages include antimycotic[3] and weak antimicrobial (especially after abrasion)[4] attributes, and resistance to tarnishing.

Nordic Gold was developed by Mariann Sundberg while she worked for the Finnish metal company Outokumpu.[5]

References[]

  1. ^ Predecimal.com. "The selection of the alloy for the New Euro Coins". Retrieved 2020-03-20.
  2. ^ "What is Nordic Gold?". European Copper Institute. Retrieved 2020-03-20.
  3. ^ Quaranta, Davide; et al. (January 2011). "Mechanisms of Contact-Mediated Killing of Yeast Cells on Dry Metallic Copper Surfaces". Appl. Environ. Microbiol. American Society for Microbiology. 77 (2): 416–426. doi:10.1128/AEM.01704-10. PMC 3020553. PMID 21097600.
  4. ^ Horton, D.; et al. (2015). "Tarnishing and Cu Ion release In Selected Copper-Base Alloys: Implications Towards Anti-Microbial Functionality". Electrochimica Acta. 169. doi:10.1016/j.electacta.2015.04.001. Retrieved 2020-03-20.
  5. ^ Kuparinen, Tuulikki (19 December 2001). "Kultaiset eurokolikot syntyvät Outokummun kupariseoksesta". Ilta-Sanomat (in Finnish). Retrieved 7 February 2021. Yhtiön tutkimus- ja kehitysasiantuntija Mariann Sundberg on kehittänyt Nordic Gold -kuparimetalliseoksen
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