depending on your yeast, not all krausen 'heads' disappear. krausen falling is not what you use to know if the beer if done in primary. a hydrometer reading is.
off flavors are likely due to fermentation temperatures and/or the yeast used.
15 days is a bit long in primary, but not out of the question, and honestly its partially based on final gravity (the beer is done) and partly on personal preference.
as far as off flavor descriptions: buttery? butterscotch? fake butter on popcorn? green apple? rubbery? band-aid flavor? those are they 'typical' off flavors, besides sourness which would indicate an infection, rather than a 'yeast produced' ester or fusal alcohol causing the off taste.
but 'a few days in secondary' means there was probably no point to secondary. secondary really needs to be at least a week or two, since its done to let the yeast fall out and produce a clearer beer.
extract beers are typically a little darker...the extract process tends to darken it a bit, and if you did only a partial boil of al lthe extract up front, it may darken a bit more.
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Malkore
Primary: English Mild
On tap: Pale Ale, Lancelot's Wheat, English Brown Ale, Steam Beer, HoovNuts IPA
Bottled: MOAM, Braggot, Raspberry Melomel, Merlot, Apfelwein, Pyment, Sweet mead, Cabernet
Gal in 2009: 27, Gal in 2010: 34, Gal in 2011: 13, Gal in 2012: 10
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