Cooling in an ice-bath: top on or off?

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dsuarez

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I usually cool in an ice bath, and have always done it with the pot lid off. I have read in a few places that this can be done with the pot covered. Will there be noticable DMS in the finished beer? Will cooling w/ the top on help maintain some of the oils of my whirlpool hops? Which is the more sanitary practice? Whats the better method: on or off?
 
I don't use an ice bath, but I put the lid on when the wort is about the temperature of a hot (but tolerably drinkable) cup of coffee. My reasoning is that this is about the top of the food safety "danger zone" and probably around the bottom of significant DMS conversion, right around 140F.

Fermentation will blow off way more hop aromatics than hot open wort, so don't worry about that.
 
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