Have made some Elderberry wine and thought it was finished fermenting. It had been sat in my garage for about a month since primary ferment finished, I had racked it once and then put it in to bottles. I opened one last night as my brother wants to have a taster but I noticed it fizzed when I opened the bottle and there was a very fine mist in the neck of the bottle, is this secondary fermentation? I have put it all back in the demijohn for now.
Thanks for advice in advance