I have not brewed a pure extract batch in quite a while, but you may be adding too much heat to your kettle. To minimize darkening, turn down the heat until the boil is just barely sustained. A gentle, rolling boil is all that's needed to isomerize alpha acids and drive off undesirable compounds like chlorine and DMS.
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The Fiesty(sic) Goat Brewery est. 2007 & Clusterfuggle Experimental Ales est. 2009
Planned: Fat Man Brown Porter (Pro-Am #2), WLP 351 Hefeweizen, WLP 860 Munich Helles
Primary: Centennial Falcon IPA (Pro-Am #1), sLambic I
Secondary: Flanders Red
Kegged:Himmel un Ääd Kölsch #8, Farmhouse Session Saison Pilot Batch, Chocolate Milk Stout, Pale Ale, Chili Smoked Porter, Berliner Weisse w/ Brett #3
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