Quail eggs are very difficult to candle, especially for a beginner who probably doesn't own a really good candler, but most people own a phone that just happens to have a decent light source. This is a guide for the beginner for what is normal for developing coturnix quail eggs candled with a phone light. Most especially it is a reassurance not to panic when you can't see veining/embryos in most (or any!) of your eggs. This is what normal/typical phone candled quail eggs look like, not...
The Beginner's Photo Guide to Phone Candling Coturnix Quail Eggs
The Beginner's Photo Guide to Phone Candling Coturnix Quail Eggs