I candled my eggs last night and had a terrible time! It was SO hard to see through the dark brown marans eggs: argh! I couldn't take pictures, so this thread is super helpful to me - thank you!
Oh, it was day #7... we had one definate dud (looked alot like your number four, but very pore-full), one visible dark chick growing and five "idunnos"! LOL ... I plan to candle again at day 14. Does that sound right to you all?