There was a thread a couple of years ago that proved the brown coating does penetrate the whole shell. Unfortunately the poster providing the good links was very rude about it and those links got deleted.
If you search the Internet hard enough, you can find the information to disprove what...
Both parents contribute to the genes that the offspring will have concerning egg color. Since the mother is an olive egg layer, she most likely has one blue egg gene and multiple brown egg genes to contribute. The odds of the offspring getting a blue egg gene from her should be 50%. Silkies...