glockspeed31

Recipes 

I brewed a porter, fermented for 10 days and transfered to secondary. I spilt off 1 gallon into a gallon glass carboy (brand new, rinsed with hot water 3 times and sprayed with starsan). Also added 7 teaspoons of raspberry extract from a new bottle. Six hours later, there is a white/yellow thick foam on the top. The other part of the batch in the 5 gal carboy looks fine. Any ideas if this is infected and can it happen that quick?

BadBeagleBrew

Recipes 

Doesn't look infected to me, if there was sugar in the extract your fermentation could have started back up. Or fermentation wasn't quite done yet and the movement got the yeasties all excited.

RM-MN

Recipes 

It looks like you have a head on your growler of beer. Not infected, just outgassing of CO2 from moving the beer causing bubbles.