Anyone have tips for candling quail eggs?

[Avonshire]

I have some quail eggs in the bator for the first time. Their shells are dark and small so it is hard to see in them. Just wondering if anyone knew a trick?

 

[sumi]

Have a look here:

https://www.backyardchickens.com/t/714757/d-i-y-candling-show-me-yours

https://www.backyardchickens.com/t/582239/candling-of-quail-eggs-possible

https://www.backyardchickens.com/t/299856/best-way-to-candle-quail-eggs