Back ذهب نوردي Arabic Паўночнае золата Byelorussian Северно злато Bulgarian Or nòrdic Catalan Severské zlato Czech Nordisk guld Danish Nordisches Gold German Oro nórdico Spanish طلای نوردیک Persian Nordic Gold Finnish
Nordic Gold (Swedish: nordiskt guld[1]) is the gold-coloured copper alloy from which many coins are made. The alloy is a type of aluminium brass. It has been used for a number of coins in many currencies, most notably in euro 50, 20, and 10 cents,[2][3] in the Swedish 5 and 10 kronor coins (for which it was originally developed and introduced in 1991),[4] as well as the Polish 2 złoty commemorative coins. Its composition is 89% copper, 5% aluminium, 5% zinc, and 1% tin.[5][2]
Being a copper alloy, it contains no gold. Its colour and density are unlike pure gold. It is non-allergenic; its other advantages include antimycotic[6] and weak antimicrobial (especially after abrasion)[7] attributes, and resistance to tarnishing. It has been studied for its antimicrobial hospital applications.[8]
Nordic Gold was developed by Mariann Sundberg while she worked for the Finnish metal company Outokumpu.[9] The European Central Bank says that the alloy is "difficult to melt and used exclusively for coins."[10]
- ^ Predecimal.com. "The selection of the alloy for the New Euro Coins". Retrieved 20 March 2020.
- ^ a b "Brass Material and Specifications Review". Engineer's Edge LLC. Retrieved 14 July 2022.
- ^ "Common sides of euro coins". European Commission website. Retrieved 14 July 2022.
- ^ Rohrig, Brian (2020). The Chemistry of Money. Royal Society of Chemistry. p. 146. ISBN 9781782629832.
- ^ "What is Nordic Gold?". European Copper Institute. Retrieved 14 July 2022.[permanent dead link]
- ^ Quaranta, Davide; et al. (January 2011). "Mechanisms of Contact-Mediated Killing of Yeast Cells on Dry Metallic Copper Surfaces". Appl. Environ. Microbiol. 77 (2). American Society for Microbiology: 416–426. Bibcode:2011ApEnM..77..416Q. doi:10.1128/AEM.01704-10. PMC 3020553. PMID 21097600.
- ^ Horton, D.; et al. (2015). "Tarnishing and Cu Ion release In Selected Copper-Base Alloys: Implications Towards Anti-Microbial Functionality". Electrochimica Acta. 169: 351–366. doi:10.1016/j.electacta.2015.04.001. Retrieved 20 March 2020.
- ^ Foster, Leanna (13 August 2014). Tarnishing of a Cu-Al-Zn-Sn Alloy Compared to Commercially Pure Copper: Implications Toward Antimicrobial Function (MS thesis). University of Virginia. doi:10.18130/v3q08v.
{{cite thesis}}: CS1 maint: date and year (link) - ^ 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
- ^ "Security features". European Central Bank. 2022.