Krausen(?) formed on harvested yeast

[rmr9]

I posted these pics on a different thread, but I figure starting a separate one way be the better way to go. I brewed a Munich dunkel at the beginning of December and finally kegged it up yesterday. I harvested the yeast and plan to repitch in another batch soon. I checked on it this morning and it almost looks like a krausen has formed on the top. I’ve harvested yeast a few times before but never had something like this happen. Contamination or yeast kicked back to activity by the harvesting process?

 

[day_trippr]

Maybe the brew that yeast was harvested from didn't actually finish fermentation...

Cheers!

 

[fluketamer]

i have had that happen before...dont sweat it.

 

[rmr9]

Maybe the brew that yeast was harvested from didn't actually finish fermentation...

Cheers!

You may be right - it “finished” at 1.016 which was higher than the 1.012 I was hoping for.

i have had that happen before...dont sweat it.

Phew at least someone else has had it happen, I’ll ease my mind

 

[fluketamer]

fwiw i have had better luck with my repitches when there is lttle to no headspace above the slurry when i keep it in mason jars.
but it may be all in my head (no pun intended)

 

[rmr9]

fwiw i have had better luck with my repitches when there is lttle to no headspace above the slurry when i keep it in mason jars.
but it may be all in my head (no pun intended)

I’m usually with you on that, typically I use a pair of quart and a pint size mason jar to collect the whole yeast cake. This one is in a gallon sized glass jug. I was thinking since the yeast was last pitched in early December, it might be worth pouring a 2 liter starter onto it to grow/wake it up before brewing a märzen. Hopefully I can get to brewing it in a week and a half or 2 weeks weather permitting.