New answers tagged dry-hop
Dry hopping releases oils into the beer. Some of which can float on top and create a slick appearance. IPAs in general being more hoppy would have more oil in them to begin with. Any solid particulates in the beer may cause nucleation around them as well creating little floating bubbles. Without seeing a picture its hard to diagnose what you are seeing ...
Dry hopping does not on its own create the conditions you describe, which sound very much like a pellicle.
The general ideas of hop bitterness, flavor and aroma related to time in the boil to hold true. Continual hopping doesn't generally produce any different aromas or flavors in my experience. In fact when over done the beer can taste fairly grassy. I don't know of too many brewers that do this still. Its labor intensive and has a fairly low return for ...
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