I have two chickens that lay the same shade and size of egg and I want eggs from just one of those hens. I have read that dieing the vents would help. My question is will it effect the hen since the die is toxic? i cant isolate her she gets distressed. I cant take the other one out If I do she will get distressed too. And can i hatch the ones that are died? or should i die the other hens vent. How would you die the vent?