There was an experiment conducted by Rock Bottom that I refer to.
https://community.mbaa.com/HigherLogic/System/DownloadDocumentFile.ashx?DocumentFileKey=eede7cbc-9836-48d8-ab6b-d6b8b53e7792&forceDialog=1(Note: this was done in a commercial brewery so could vary at home)
1. highly hopped beer might be better made using brewing liquors with lower sulfate concentrations.
2. longer postboil residence of kettle hop additions led to more hop flavor and aroma.
3. dry hopping was the best way to develop hop aroma, it might not be the best way to develop hop flavor.
4. a combination of long postboil kettle hop residence and dry hopping seemed to maximize combined hop aroma and flavor.
Dave Green summarized this study in his BYO article on the topic of hop stands:
“Another factor to consider is how to handle dry hopping your hop-forward beers if you employ an extended hop stand.
Rock Bottom Restaurant & Brewery performed an extensive study on hop stands and dry hopping under the guidance of the Portland, Oregon brewmaster at the time Van Havig, (now of Gigantic Brewing Co., Portland, Oregon).
The study was published by the Master Brewers Association of the Americas Technical Quarterly and considered beers that were hopped in four different ways, short hop stand (50 minutes) and no dry hops, long hop stand (80 minutes) and no dry hops, no hop stand and just dry hops and finally half the hops in hop stand (80 minutes) and half the hops for dry hopping.
Beers produced using exclusively hop stands and the beers produced using exclusively dry hops will both result in well-developed hop characteristics, but there were some nuances. The long hop stand developed more hop flavor and aroma than the short hop stand indicating that essential oils were still soaking into the wort after 50 minutes. The exclusively dry hopped beer received its best marks in the aroma department, higher than the hop stand beers, but scored lower for its hop flavor.
The beers where only half of the hops were added for the hop stand and half were added for aroma ended up scoring high in both departments.
Havig's study also showed that adding 1 lb./bbl (0.45 kg/bbl) Amarillo dry hops produced the same amount of hop aroma as ½ lb./bbl (0.23 kg/bbl), indicating diminishing returns at higher dry hop rates.”
Shellhammer limit = dry hop @ 1.1 oz/gal or 2.1 lbs/bbl. 1 oz/ gal is close enough IMO.
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