Is any black mass in the egg a good thing?

[Matt98]

Okay so I was away from June 1st to 23rd, but on the 15th my black rock went broody! when I came back she had 12 eggs, and I couldn't differentiate between the oldest and youngest eggs so I just left them with her. I candled them today and some of them are more promising than others. I have 2 porous eggs which im a little worried about, but they still have the black masses when I candle them? Im currently trying to get a better light to see what the story is as my current one isn't that strong and you cant make out anything except a vague black floating patch and the air sac. Arent porous eggs usually duds either way? Thanks for any help

 

[GitaBooks]

I hope this link helps: http://keeping-chickens.me.uk/chickens/how-to-hatch-eggs/candling-eggs

As for porous eggs, I"m not sure, but give them a chance. Sometimes eggs surprise you!

Best of luck!