Duck egg looks green on candling - help?

[CloudyDucks]

I'm on day 28-29 of a batch of mixed babies (indian runners, swedish black, and white pekins.) 3 have pipped (12 hours ago) and 7 have not. One of the ones that hasn't pipped when I very carefully candled it to make sure it was still alright in there, the inside had a yellow-green tint, like the color of cartoon mucus. The baby was still moving around, but every other egg had a clean orange glow look to it. Is this okay? What should I do?

 

[Erka97]

That sounds very odd, but I'd leave it if the baby is still alive. I've had eggs hatch from wild nests with spots of what I can only describe as rot in them, but the babies were fine.
Could you possibly get a picture? I'd like to see.
Do you know which kind of egg it is?

 

[CloudyDucks]

I tried my best but this isn't a great shot. You can see the shadow of the beak in the airsac up there, but it's just such a strange color and none of the others look like that. As to the breed I don't know. All of my girls were nest sharing when I collected the eggs. It could be any combination of the three. The only thing it can't be is a pure swedish because I only have a hen and no drake.

 

[Erka97]

It sounds like it's progressing normally, at least. I would wait until it hatches -should be soon if you've got a beak in the air cell- and check the chick and egg to see if there's anything abnormal that would be causing the color. I don't think I've seen a greenish duck egg before, but if the chick still hatches I wouldn't think it's anything to worry about.

 

[CloudyDucks]

I'll keep an eye on it. Thanks for the input.

 

[dailyduck]

Curious as to if this egg hatched and if you investigated what made it green and also what the duckling looked like. Any information for an update?