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How to purify gold | sciencing.Apr 24, 2017 in 1874, dr emil wohlwill of the norddeutsche affinerie in hamburg, germany, developed a method to purify gold through electrolysis the unpurified gold ore is fashioned into a 100-ounce anode, whereas pure gold strips make up the cathode the electrolyte solution is a mix of gold chloride and hydrochloric ac.