I made and Irish style ale, and while the mash steps went very well, the fermentation seamed to finish after 14 days, and as it stands now 50 days after brewing, picked up diacetyl. Not sure if it got infected, or caused by the yeast not fully cleaning up. I used S0-4 and checked gravity at 10 days 1.013 and 14 days 1.013 so I figured it was finished. Anyway any chance of the butterscotch taste fading. It's not horrible, but not what i was shooting for. By the way it is kegged and carbed and on beer gas mix.