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copper discoloration from low wines


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Ran into something I haven't seen before. Yesterday I ran a CIP on my still for todays spirit run, PBW followed by citric as usual. This morning the copper was nice and bright, as I was loading the still with single malt low wines, I noticed the bright copper rapidly turning a dark streaky color. Even without the low wines hitting it. The low wines and heads are extra stinky, but the hearts are great. Any idea what would cause this??


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  • 2 months later...

Imo it’s your copper doing its job. Still charging does produce vapors they’re gonna be low in boiling point and pretty nasty, lots of work for your copper to do! 

You notice anything irregular/different with your ferment?

someone with a chemistry degree will probably come around and talk shit but that’s just my .02

Edited by SlickFloss
typo Cooler to Copper
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