I got a dual-tap kegerator for Christmas, so I brewed 2 beers to test it out. The following is the timeline of events...
- Jan 6 - Brewed Scottish Ale & IPA
- Jan 29 - Disassembled, cleaned, sanitized, reassembled, & filled kegs (also discovered the kegerator had a broken filter dryer, so it wouldn't cool)
- Feb 11 - Began force carbonating kegs at room temp (59 F)
- Feb 23 - Hooked up kegs to new replacement kegerator & cooled to 39 F
- Feb 24 - Turned CO2 back on to serving pressure & drew samples...both beers tasted great
- Feb 25 - Poured pint of each & new metallic off-flavor in aftertaste was present (tried the Scottish Ale out of a bottle & it tasted great, no off-flavor)
The beer was in the kegs for about 4 weeks & the first couple pours were great. It was only after it sat for 24 hours after I turned the gas back on that the off-flavor developed. Can CO2 impart this flavor? It seems like I've isolated the problem to the kegs since the bottled version of the Scottish Ale was great.
Anyone have any ideas to where this metallic aftertaste came from?...Will it fade over time? For what it's worth, it's definitely more prevalent in the Scottish Ale.