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Can I backsweeten after carbonation?

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asdfghjkl123

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I'm about to bottle some elderflower champagne but it's not really to my taste at the moment (very strong, dry and yeasty).

I was thinking of adding sweetener to help but would prefer to do this after carbonation just so I can see how it tastes without it (maybe it won't be necessary once there's some bubbles!)

Is this advisable or is it better to add during the bottling process? I am talking about something non fermentable like Erythritol or Xylitol.

I am bottling in strong glass swingtops. It's fully fermented at the moment so I will also be priming with sugar to get some fizz.
 
When I want to backsweeten, I do it before carbonation. Doing it after carbing is not only a little dangerous, but as you need to stir in the solution (e.g. Xylitol dissolved in water), you're knocking out some of the carbonation. In short, it's too unpredictable and I wouldn't do it. Others may know more about this, so only take this as my advice and not gospel, but I wouldn't do it.
 
You might consider sweetening at serving?

If you do add to the bottle:
  • Do not use dry ingredients. They will foam like crazy.
  • Consider chilling the beverage to 30F to 32F if possible.
  • Chill the liquid sweetener to 32F if at all possible.
  • If you put a cap on loosely and let it sit, CO2 may purge the headspace a bit.
  • But if you carbonated over 3 volumes, you may need to cap on foam asap.
  • IMO don't worry about mixing unless you need to drink it soon.
 
Oh, and:
  • Use only non-fermentable sweeteners
  • Consider how you are measuring per-bottle doses. A syringe may be a good choice.
  • If using a syringe, try to spray the sidewall of the bottle neck. Spraying straight into the beverage may cause foaming.
  • Method of delivery may need some experimenting.
 
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