hello, so I am by no means someone who is experienced with incubation, but one of my hens went broody so I decided to to crazy and stuck some eggs under her. so far she has been a pro, BUT I have hit a bit of a snag because without thinking forward I stuck some very dark eggs under her and doesn't look like I can candle them well now. so anyone know how I can figure out if things are going ok? weight of egg? stronger light?