So, you’ve decided to hatch some chicks, you’ve set your eggs in the incubator, and now you’re just dying to know if those little embryos are developing? We’ll, you’re in luck, because we have the inside scoop on candling eggs on day 7 and everything you might see when you look inside!
By the time day 7 rolls around on your incubation calendar, the teeny chicken embryos will have already done an extraordinary amount of work. In just seven days the tiny little life form has already developed into a recognizable chick, just very, very small.
In this post you’ll find out exactly how to candle an egg, and what you can expect to see inside during the first week of incubation!
What is candling eggs?
When you’re incubating eggs, it helps to have some idea what’s going on inside, but you can’t exactly crack them open to see, right? So instead, we shine a bright light through the egg to see the contents inside. During incubation, candling is done a few times to see how well the embryo is developing.
Some eggs are easier to see inside of than others. White and light brown eggs are usually very clear, whereas dark brown eggs, and green/blue eggs are very hard to see inside.
How do you candle eggs?
Most importantly, before you ever handle fertile eggs that you’re incubating, make sure to wash your hands really well with antibacterial soap
To candle your eggs, you can either use a special egg candling lamp
If all you have is a flashlight, don’t fear! Candling eggs with a flashlight 
How often should I candle eggs?
It’s a good idea to candle the eggs on day 7 and day 10, then again on day 18 right before you set the eggs into lockdown. Don’t handle the eggs at all after day 18, as the chicks inside will be prepping themselves for hatch day and shouldn’t be disturbed.
It’s a good idea to handle the eggs as little as possible during incubation to avoid contaminating or breaking the eggs. If you can hold off on the temptation to candle them constantly (I know this is super hard to do!) it will be better for the eggs and developing chicks.
What will I see when candling eggs on day 7?
On day 7 of candling eggs, you should start to see the beginning stages of development of your chick embryo.
If the embryo is developing, you will see reddish pink veins running from side to side across the egg. Attached to the veins you might see a dark orb, which is the developing embryo. You may be able to see the embryo’s eye, which will be a large black circle. You may even see movement at this stage if you look carefully!
If there is no developing embryo inside the egg when you candle it, you’ll simply see the yolk of the egg floating around. It can be really hard to tell this early in incubation whether or not the chick is starting to develop, especially if you’re trying to candle blue or green eggs.
You may see a black ring in the egg, called a blood ring (like in the photo below), which means that the embryo started developing but then died. These eggs can be disposed of right away. We usually bury them in the yard, as they can’t be composted and we don’t want any animals getting ahold of them and making a mess.
What if I can’t tell what I’m looking at?!
If you can’t quite tell what’s going on inside the egg, there’s nothing wrong with putting it back into the incubator and trying again in a few days. Our go-to strategy when candling eggs on day 7 is to remove any eggs with a blood ring in them and leave the rest. We then candle again on day 10 to get a clearer picture of what’s going on inside the eggs.
You may need a brighter flashlight
Want to find out what happens next?
We’re only taking you up until day 7 of incubation in this post, but if you’re curious, our friends over at 104 Homestead wrote a great post detailing what’s coming next for your teeny little embryos! Check it out here!
If you’re incubating eggs and hatching chicks, we want to hear about it! Comment below with your experience, we love to chat chickens!
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