I'm seeing this thing happen soon after I add my yeast and was wondering what it was called and the science behind it.

enter image description here

2 Answers 2


"High Krausen"/"Exponential Growth Phase" As the yeast feeds it produces co2 and the bubbles make a foam of yeast and other materials in the beer.


How soon is "soon"?

It looks like you've sprinkled dry yeast across the top of your (chilled) brew kettle and maybe waited 10-20 minutes? If so, this is the yeast "blooming" in response to being reactivated from their dried state. At what temperature is the wort? Can you provide any more detail about your process?

  • Wort is at room temperature.
    – Neil Meyer
    Jul 27, 2016 at 8:29
  • Looks like a lot of yeast for it to be from dry yeast, no? Maybe OP is using three packets.
    – brewchez
    Jul 27, 2016 at 10:32

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.