Colour of larvae in Q cells?

[Suzi Q]

I culled a number of emergency Q cells yesterday, and noticed that some of them had like a purplish line down the back. I am hoping it is normal and just a sign of a different stage of development of the larva.

 

[hallshoney]

that will be the blue blood then

 

[Suzi Q]

Always thought my bees were aristocrats!