I tend to cull cockerels or sell pullets as layers that are completely black at 2-3 months of age. I have plenty that have good color at that age, so in my line, I do not think those birds are going to have enough copper color. It is one of the things I breed for. I what the color to show early and not have to guess or wonder if it will come in later since from my experience, it does not, or at least not enough. I don't want to have to feed them longer than necessary if they are not what I want in my breeding program. Same with excess color on the cockerels. That shows up early on as too much copper spotting on their breast and in my experience, they just get more with maturity.