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Posted: **Sat Feb 24, 2018 7:25 pm**

So I heard this today during a distillery tour. Didn't believe it but there it is. I'll research some more and post here.

Fermented Beverage Production
edited by Andrew G.H. Lea, John Raymond Piggott, John R. Piggott

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http://whiskyscience.blogspot.ca/2014/10/copper.html" onclick="window.open(this.href);return false;" rel="nofollow

There is some evidence of increased ester formation from acids and alcohols during the distillation, but that may happen in higher temperatures anyway and have nothing to do with the copper. Copper seems to have some effect on phenols, decreasing slightly the amount in the distilled spirit.

Posted: **Sat Feb 24, 2018 7:32 pm**

And some mention of copper chromite as a catalyst here: https://en.wikipedia.org/wiki/Ester#Reduction" onclick="window.open(this.href);return false;" rel="nofollow <- I doubt there's any copper chromite in our stills, but it show there is something to it.

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Copper catalyzed esterification

Copper catalyzed esterification

Re: Copper catalyzed esterification