First yellow one of the year

[BB King]

A/S on Saturday checked today Monday for any missed QCs. Hinged lid still in place on queen cell in new hive and new queen emerged and marked. Probably would have swarmed if I had been a day later with the A/S?

 

[Boston Bees]

You mark them before they are mated?

 

[Erichalfbee]

You mark them before they are mated?

A lot of commercial beekeepers do.
They say it makes no difference to successful mating.