A Tale of Two Pales

These are actually the same beer. Same malt bill, same process other than a slightly longer mash on the darker one, different hops in the same quantity, and different carbonation levels. The left beer was hopped with Pacific Gem (13.2% alpha) and Australian Galaxy (13%) and the right was Columbus (13.9%) and Simcoe (13%). Never mind the shitty picture quality - you can still get the point.)

They're all small differences, but this is one of those one of those experiences that continues to blow my mind and preconceived notions about what matters in brewing.

I'm not sure where the dramatic difference stems from, but here are a few possibilities:

• There are a few episodes of Can You Brew It where Jamil talks about how particulate still in solution in the beer can actually make it appear lighter. 
• The actual oil levels in the hop combinations were different. I know that hops and yeast tend to do a little chemical dance at different points of fermentation, so it's possible that the beer on the right flocculated out better because of this.
• The dissolved volumes of CO2 were different (I carbonated the left and Jeremy did the right), which again could affect color
• One of the two beers (I didn't take great notes on the order we brewed them in) was mashed about 15 minutes longer than the other. I don't think that would have a significant impact, but in this case I can't rule it out.

So ultimately I don't really know how two beers with the same malt bill ended up looking so different, but it was an eye opening experience.