My pullets JUST started laying, this is my 13th egg from 6 Isa Browns. They've all varied in size, darkness and speckles, which i expected. But this one had what looked like a spot of brown wiped off when i collected it! I took it inside, washed it, rubbing it firmly to get the dirt/manure off and more of the darkness rubbed off! I'm assuming this MAY be normal esp in new layers, i would just like to understand why!?