I mark all my air cells at lockdown. Mostly so I know which way to lay them down lol. And, I only mark dates on them when they'll be mailing out so the other person knows how old they are.
Cream Crested Legbars, BCM, Rhodebars, bearded silkies, good laced/buff laced polish, black/lavender ameraucanas
Bourbon red, red bronze, royal palm, mottled black
I also make hen saddles, PM me for details!