thatshowyougetants
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I've read many people on these forums claim that you can (and should) add your extract late in the boil. Claimed advantages are that the resulting beer will be lighter in color and have less of that mysterious 'extract twang'.
I'm reading John Palmer's How To Brew and according to the section on Hop Utilization there is a clear and non-trivial relationship between boil gravity and hop utilization (and therefore IBUs of the finished beer).
For example for a 60-minute bittering hop boil the utilization with a gravity of 1.03 is 0.276 while with a 1.05 gravity it's 0.231. If you extrapolate to a gravity of 1 (boiling the water without extract) the utilization would be approximately 0.34. This could make a difference of about 16 IBUs in the final beer (using Palmer's example of a 9.6 AAU 60 minute boil).
If I'm interpreting this incorrectly please feel free to correct me. But it seems that nobody should be advocating adding extract late in the boil without warning that IBUs will be significantly affected.
I'm reading John Palmer's How To Brew and according to the section on Hop Utilization there is a clear and non-trivial relationship between boil gravity and hop utilization (and therefore IBUs of the finished beer).
For example for a 60-minute bittering hop boil the utilization with a gravity of 1.03 is 0.276 while with a 1.05 gravity it's 0.231. If you extrapolate to a gravity of 1 (boiling the water without extract) the utilization would be approximately 0.34. This could make a difference of about 16 IBUs in the final beer (using Palmer's example of a 9.6 AAU 60 minute boil).
If I'm interpreting this incorrectly please feel free to correct me. But it seems that nobody should be advocating adding extract late in the boil without warning that IBUs will be significantly affected.