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A: The best guide is long term stability: if your gravity has remained stable between several readings, then your beer may be ready for packaging. However, since the different organisms involved in sour beer production grow at different rates, a beer that was stable over a short period may begin fermenting again. Ideally, you should look for stable gravity readings over a period of two months. When blending (especially with a non-sour beer such as a clean Saison), it is best to rest the blend in a fermenter for two months to make sure the gravity is stable. Don't assume that a low gravity clean beer such as a very dry Saison won't further attenuate once blended with a sour beer with Brett in it. If kegging instead of bottling, packaging before the final gravity is reached is ok since kegs can hold the additional pressure, and the carbonation can be adjusted. See the [[Packaging]] page for details on how to package your beer.
The other factor to consider is how does the beer taste? If it tastes good, and the gravity is stable, then you can package it. If the beer does not seem to have a mature flavor from the ''Brettanomyces'' and has off-flavors that need to age out, then feel free to age it longer. If the gravity is stable and the beer still doesn't taste fully matureSome off-flavors will change even when bottled or kegged, it can still be packaged and stored at room temperature or cellar temperature but others (such as sulfur) will need to mature in dissipate out of the keg/bottlesbeer slowly over time.
==I want to buy a ph meter==