Isbars are GREEN egg layers. Unfortunately, not all the stock carries two copies of the blue egg gene to make the green, so brown egg layers are possible. (I think I explained the genetics earlier in this thread, or the other Isbar thread.) The brown egg layers should not be used for breeding, but they should still make great layers.
Arh sorry, a blond moment- I meant green egg layers. I should know they have laid me many many wonderful green eggs this summer. I did see your post which was really helpful. I guess my question is: should a brown egger be called an "isbar" if doesn't lay green eggs? If my Rhode Island Red laid a green egg I couldn't really say she is a RIR. Could I?