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The processes used to refine gold are many centuries old. The two most common methods of refining gold are refining with flame and the use of chemicals.

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Gold processing: Gold processing, ... By 2000 bc the process of purifying gold-silver alloys with salt to remove the silver was developed.

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How to Refine Gold. ... How does nitric acid purify gold? wikiHow Contributor Nitric acid dissolves the other metals commonly found alongside gold.

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There are various methods used to purify or refine gold and they can be categorized into three: ... Among all the methods of purifying gold, ...