Good point of Allens-however I have seen books which simply say that
cells sealed within 4 days MAY be too old to make good queens- I guess
seeing a cell sealed at a 4 day  inspection could mean that it was
sealed 1 , 2 or 3 days after the initial manipulation , in which case
the grub would not have had it's full exposure to the all important
royal jelly.

Alan Riach - Edinburgh