I guess it probably only takes a generation or 2 to mix things up if careful records and marking of birds isn't done.
2 of the cockerals from this group are solid blue in appearance, 1 has the wave in the comb and the other 1 looks to have a straight comb. So if one was to test to see if they had copper or were true blues would you mate them to another chicken breed - say for example I could use an Andalusian hen- hatch out some eggs and see if copper pops out? I'm guessing that I won't want to use one of the splashes from that hatch as she could be a copper carrier and that won't tell me for sure?
that would probably work fine. I test mated the offspring from the cross as well and there was still no leakage in any of them..I did it just cause I wanted to make sure... splash might be hard to gauge indeed...my only splash copper that shows coppering is my roo.