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I had a Belgian Dubbel in primary about two weeks, ending up with a gravity of 1.016. Then 3 days ago I racked onto 5.5 lbs of cherries, leaving the yeast cake behind.
I expected the residual yeast to cause additional fermentation and generate CO2, along with bubbling through airlock. I measured the gravity at 1.014, but that seems within the margin of error.
This is my first fruit beer: is this progressing as it should, or should I add more yeast to advance fermentation?
The fruit very likely has sugar, so it will cause fermentation to kick-off again when added, thus producing CO2. Obviously not with the same vigour as primary fermentation - although if you added a lot of fruit, maybe. Is the yeast able to get into the fruit? The skins are fairly tough for yeast, so will need to be broken somewhat. I typically mush my fruit a little with a potato masher (or slice - depends on the type of fruit).
I wouldn't be too concerned about the airlock not bubbling - this is mostly an indication that it's not perfectly sealed somehow. Or maybe it's going slowly, and you've not witnessed the odd bubble.
One other thing I would like to add - when I've added fruit to beers, sometimes it doesn't taste so good until it's been conditioning for a while. For example: A friend made a raspberry stout, and it was OK after a month or so, but after 3 months it was very nice indeed. So if at first the flavour is not pleasing, just wait.
Cherry dubbel sounds like a good mix BTW.
