Right now I have 6 Lavender orpingtons (1 roo 5 hens) I really love them and would like to keep them pure so I can possibly sell hatching eggs next spring but I would really like to add a couple EE's or Welsummers just for fun (hens only) Would this be okay or is it considered not proper in the chicken world? I figure if I only have a Lav Orp roo then I will be able to tell which eggs are pure orp or not by color right? Advice?