Those are pretty birchen eggs. I would love to cross my silvers with my dark laying black coppers but then I would still have the issues with the gold leakage grrrr. My blue birchen boy has some gold leakage in the top of his wing where the bcms would normally have coppering. I am gonna just have to work on the solid black and blues egg color and cross that into the birchens I think...My silver blk birchen girl has mossiness issues as well. I don't know what color of egg she is gonna lay but I'd bet its darker than sassy's. She should start laying any time now. I have a white orp pullet, her same age that just started laying so its her turn now lol.