'GOLD refining using food additive E250 (sodium nitrite)'

'Gold button containing silver and PGMs is refined using sodium nitrite (NaNO2 - a meat curing ingredient)  as precipitation agent leaving     PGMs in solutions while precipitating pure gold' 

Tags: gold , oro , pure gold , altın , ouro , gold refining , gold recovery , aqua regia , gold extraction , gold parting , gold separation , sodium nitrite , gold alloy , zoloto , золото , 999 , 9999

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