Helles krausen has a sort of top-deck thing going on

[mtb]

Pictured below is a batch of Helles fermenting using Wyeast 2124 (Bohemian Lager). I committed a cardinal sin and peeled back the cling wrap so I could get a better shot.

The side of the fermenter where krausen is brown, is resting against a kegmenter containing the same batch. Is it a temperature thing? Been fairly stable in the room @ 12C and STC readings indicate that temps are stable - but the probe is resting between the two vessels so the white-krausen side could arguably be a wildly different temp. Didn't think it could vary that wildly though.

 

[Jack of all biers]

I've had that happen many times. Nothing, but normal is going on right there.

 

[mtb]

Oh good.

 

[rossbaker]

I've had the same thing with us05 before. The dark brown was on the same side as the heat pad which was standing up on its side in the fermentation fridge (not in direct contact).