Broody duck-candleing question

[Tolayducks]

Hello! So I have a broody duck who has been sitting on eggs since Aug 16. Everything has looked good in development from what I’ve researched but this morning I was concerned because I can no longer see veins… any advice would be great… she leaves the eggs for a bit in the afternoon when it’s close to 100 degree late and covers them up with shavings … other than that she stays on them. I’ve posted pics from this morning. There are 8 eggs and now they all look the same

 

[Tolayducks]

Moved the light to a better place was able to see veins