Absinthe Pete Posted March 23, 2011 Share Posted March 23, 2011 So the still is finished and installed at my distillery. I'll be posting pics and so forth once everything is setup. Anywho, the question is I need to passivate the stainless steel still but I have copper in the still that can't be removed. So what can I use to passivate the stainless without hurting the copper? My rep from Zep Chemicals would normally recommend a blend of Nitric Acid and Phosphoric Acid to passivate the stainless but her lab says it'll turn the copper black and I won't be able to get it back to copper color. Any help would be appreciated. Thanks. Link to comment Share on other sites More sharing options...
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