Stout that I have bottled has come out flat. A little hiss when I open the bottle, but no head. I added 1/2 tsp to each bottle when bottled up and instructions said to leave 2.5cm at top of bottle for pressure to build and leave in warm for 48hours. I was a little worried about bottles bursting and have probably left about 5cm. Is this the reason it's flat? If so is it possible to open them, top all up from one bottle and add sugar again, bottles currently in fridge will this of killed the yeast?
Thanks,
Josh
Thanks,
Josh