I wonder whether you have misheard 'Bucher's Bloom' for 'Butcher's Broom'. If you click here, that will link you to a web-page dealing with the latter which is a herb.
Or you could mean Butchers bloom.This is when a piece of red meat is cut for display.When the piece is initially cut the meat will be a dark red colour but after a short space of time it becomes bright red.This is due to the cut surface absorbing Oxygen from the air.This makes the meat very attractive and will sell more for some illogical reason.The same principle applies to arterial blood(bright red) and veinous blood(dark red).So junkfudguy which did you mean?