Terrible idea .. with 100 bees it's pretty much doomed .. dummied down, well insulated and fed - 10 % chance but they might make it through.
Poly nuc, one frame of comb & bees, two frames of pollen & honey; dummy the rest of the space with a piece of PIR. Feed fondant (not syrup) and push it down the feeder slot so that it contacts the top bars. BS & OCFH poly nucs are best for this as the feeder floor has a removable silicone plug. Tape a slice of something solid to the mesh floor and don't give up hope.
Also noting ericbeaumont's suggestion. How BK's explore every possible rescue plan for their colonies! I admit that I have an emotional attachment to my bees, and feel sadness when other BK's report colonies as lost or in serious peril.
Are the darker bees now flying just robbing out the weak colony?
That would be the first thought. I have watched these girls very closely these last weeks, I generally have a brew sitting on a composter about 6ft away especially when I know they will be flying. The numbers outside watching incomers are about 6 to 10 and once inside they appear to stay. I am guessing this colony has picked up some strays which have decided to call it home. I would not have taken any notice if it had been one of the other colonies as they all look very similar, but this one had predominantly yellow stripes as you would expect. If they survive, spring will reveal all.
A way to find out is to shut the colony up at night and see if these bees are back in the morning. Getting too cold for anybody to be flying though.
