What can cause color loss in a finished beer?
I made an American Brown ale that turned out very dark brown.
I opened the last couple of bottles a month or so apart after most of the batch.
The color seems to have faded to a significantly lighter shade of brown,
still in the brown ale normal range but different enough from the fresh beer to confuse me.
What can possibly cause this phenomenon?
RECIPE:
Based on:
https://www.brewersfriend.com/homebrew/recipe/view/784491/brown-ale-chance-dodds
Title: Brown Ale
Brew Method: BIAB
Style Name: American Brown Ale
Boil Time: 60 min
Batch Size: 11 liters (fermentor volume)
Boil Size: 17 liters
Boil Gravity: 1.031
Efficiency: 60% (brew house)
No Chill: 20 minute extended hop boil time
STATS:
Original Gravity: 1.049
Final Gravity: 1.010
ABV (standard): 5.12%
IBU (tinseth): 32.19
SRM (morey): 19.59
Mash pH: 0
FERMENTABLES:
2.5 kg - Pilsner (87.7%)
200 g - CaraMunich II (7%)
100 g - De-Husked Caraf II (3.5%)
50 g - Melanoidin (1.8%)
HOPS:
5 g - Magnum, Type: Pellet, AA: 15, Use: Boil for 40 min, IBU: 20.44
5 g - Ekuanot, Type: Pellet, AA: 14.25, Use: Boil for 0 min, IBU: 11.76
25 g - Ekuanot, Type: Pellet, AA: 14.25, Use: Dry Hop for 5 days
MASH GUIDELINES:
1) Infusion, Temp: 68 C, Time: 45 min, Amount: 17 L
OTHER INGREDIENTS:
1 tsp - Irish moss, Time: 10 min, Type: Water Agt, Use: Boil
YEAST:
Fermentis / Safale - American Ale Yeast US-05
Starter: No
Form: Dry
Fermentation Temp: 18 C
Pitch Rate: 0.75 (M cells / ml / deg P)
PRIMING:
CO2 Level: 2.52 Volumes
Generated by Brewer's Friend - https://www.brewersfriend.com/
Date: 2019-12-18 10:39 UTC
Recipe Last Updated: 2019-09-30 16:12 UTC