Image: Four nines fine gold

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Description:The photo shows 1 troy ounce (31 g) of four nines fine gold (999,9) from Valcambi, a precious metals refining company located in Balerna, Switzerland. "Nines" are the number of consecutive nines in a percentage such as 99% (two nines) or a decimal fraction such as 0.999 (three nines). Their common uses include grading the purity of materials.
Title: A four nines fine gold bar
Credit: Own work
Author: Nbarth
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC BY-SA 3.0
License Link: https://creativecommons.org/licenses/by-sa/3.0
Attribution Required?: Yes

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