Hmm...my experience a few days ago of uniting 2 hives was not so successful. I've never done it before. Had a weak, queenless colony which I thought might struggle through the winter after it swarmed a few weeks ago [my negligence, but you learn by your mistakes...] I moved it gradually next to a good colony and placed the BB on top of the strong colony separated by a single sheet of newspaper with a few short knife slashes in it. Result - carnage and hundreds of bodies outside the entrance. Should I have left the paper intact and let the introduction be slower? I'll use thicker paper next time, I think.
