Probably a difference in ingredients, I doubt any of the breweries are using sulphites, anything over 10ppm requires a warning on the label (as with wines). The "sulphite headache" from wines is actually attributed to Histamines which are produced during the malolactic fermentation of red wines. White wines generally have a higher level of molecular SO2 than reds due to their increased susceptibility to oxidation.
I would look to ingredient differences for beers.
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Something is always fermenting....
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Primary: Empty
Brite Tank/Lagering: AHA Summer Ale
Kegged: Sonoma County Organic Cider, Wise One Wit v1.2.1, Helles Bock, Ommegang Abbey Ale Clone, Derangement (Belgian Dark Strong), Sarcastic (ESB), Kranky (Kolsch v1.1)
Bottled: Alt Lang Syne (Dusseldorf Alt), 99% (Calif Common), Contentment (Trappist), Kranky (Kolsch v1.0),
On Deck: Need to bottle, out of kegs!
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