Updated at: 13-09-2022 - By: Helen Skeates

To make candled eggs, all you need is a household torch. However, it’s great to have a few images of what you’re looking for in the egg to assist you find it. As a result, we’re going to talk about things like when to candle chicken eggs.

Egg Candling

Let us first define egg candling before discussing when to candle chicken eggs. You can use candling to observe the development of embryos inside eggs. This is done by placing a powerful light source behind the egg and shining it in the right direction.

Because the initial sources of illumination were candles. Candling lamps, or egg candlers as they are more popularly called, are modern lights with a narrow beam. Due to its high brightness, efficiency, and long life expectancy, LEDs have become the new standard.

Because the gadgets are compact, portable, and battery-powered, they can be utilized directly in the nest without the need for replacement bulbs. Because they don’t produce a lot of heat, they’re better for embryos. Candling allows you to monitor a wide range of traits, including egg fertility and embryo growth.

A poor egg breaking and contaminating your hatchery can be minimized. Non-viable eggs must be recognized in order to do this. Furthermore, if you’re thinking about starting a poultry farm, keep in mind that candling has no effect on the quality of your eggs.

The Complete Beginner's Guide To Egg Candling -

Incubating eggs can be taken out of the incubator for the duration of the process of candling. It’s like when the mother would take a break from the nest every day for a short period of time. During incubation, when the egg’s moisture evaporates, the air sac should grow in size.

Eggs must lose approximately 13% of their original weight during incubation. At various phases of incubation, the air sac should expand if your humidity level is roughly correct. The air sac will be larger if the incubator humidity is too low (in severely dry conditions).

Also, the incubator’s humidity should be increased to reduce the rate of water loss. The opposite is true if the air gap is smaller than normal. In order to check for cracks before incubation, we light the eggs.

They let germs in during incubation. When eggs are cracked, they’re more vulnerable to contamination. The embryos then die early as a result.

During incubation, we can use egg candling to discover viable eggs. Infertile or prematurely deceased eggs can also be removed before spoiling. Your incubator may be contaminated by rotten eggs that explode from time to time.

When to Candle Chicken Eggs?

Once the eggs have been incubated for five days, they can be examined by candle. For the greatest effects, candle eggs should be prepared in a darkened area or under dim lighting. The candler should be held against the egg’s shell, near the air sac, at the larger end of the egg.

Ideally, the eggs should be taken out of the incubator after seven to ten days of incubation. To avoid harming the developing embryo, wait until the first week of pregnancy has passed. You will be able to see more clearly after around seven days.

Blood vessel growth and embryo development can be observed by rotating the egg. At first, in viable eggs, there will be a small area with a network of blood arteries that radiate outward.

How many times should you candle eggs during incubation?

While the eggs are incubation, how many times should you check on the progress of the embryos? Check the health of your eggs before putting them in the incubator. All clears are ruled out every seven to ten days.

Another 16 days before hatching, you can repeat the procedure. Remove any eggs that are damaged or dead. Otherwise, ruptured eggs could coat newly hatched chicks with foul goo.

It is possible to find out if an egg is defective before incubation by candling it. Whether the egg was missing its yolk, cracked, had a broken air sac or a shell issue, you would be able to tell by looking at it. The development of embryos is frequently interrupted.

In order to get rid of clears and early dead eggs, you should do some candling around the 7-day mark. The day before pipping, you can remove any late quitters by caulking. Knowing how many times to candle chicken eggs is just as crucial as knowing when to candle chicken eggs in the first place..

Is candling harmful to the eggs?

No, this isn’t the norm, but it can happen if you’re reckless or take too long. It’s possible to harm an egg if you leave it on a hot bulb for a long time. Long-term removal of eggs from the incubator can result in their death.

Having a large number of eggs to candle at once is the only time this becomes an issue. A broken or damaged candle egg is more likely to occur if you use more of the candle eggs. So, be careful and use soft towels under your work surface.

How to make a candle lamp?

You can make an egg candler if you’re on a budget. Place a desk lamp with a low-energy light bulb inside a cardboard box. Make a small, round hole in the top of the box that is big enough to fit the egg’s pointy end.

How-To Candle Eggs and Why It Is Important

For the uninitiated, egg-candling is nothing more than a 4-H science project. Candling may be a new concept to you. Candling eggs at regular intervals allows you to keep an eye on the embryo’s progress, which can save you a few headaches down the road.

Making candied eggs is a simple process. It only takes a few simple materials and a short amount of time. You’ll need a dark place, a bright light, and the egg you intend to candle to get the job done correctly. GQF Manufacturing’s Cool-Lite Tester is the light we suggest you use. The egg is less likely to be dropped or cracked as a result of being handled for a shorter period of time with this equipment. Because of the tight seal created by the simple design against the egg’s base, less light escapes, allowing you to have the finest possible view of the egg’s interior.

It’s not difficult, but there is something to it, as we stated earlier. So, let’s talk about how to candle eggs correctly and confidently.

Preparing to Candle Eggs

1. Consider the reasons why you are candling your eggs.

With a candle, you can see exactly which of your eggs have been fertilized and how each embryo is progressing. This is accomplished by shining a bright light on the egg and examining the interior for specific characteristics. You shouldn’t expect a perfect hatch rate for your eggs. It is possible that some eggs never mate. “Yolkers” are the eggs in question. There are some eggs that stop developing during incubation, known as “quitters,” and these are known as such. “Winners” are the fertilized, correctly growing eggs.

It is critical to remove a yolker or a quitter from the incubator as soon as you notice them. The eggs will spoil if you don’t. If the eggs are allowed to decay in the humid environment of the incubator, gas can build up and cause an explosion. Because of the scent, the good eggs will be exposed to bacteria from the rotting ones. They are vulnerable to sickness as a result of this.

2. Gather the supplies you need to candle your eggs.

People used to use candles to decorate their eggs for Easter. Using the light from the candle, they would examine the egg’s interior from a distance. You won’t need a candle anymore; you’ll need a powerful light capable of creating a seal around the egg’s exterior. The Cool-Lite Tester is one of many lighting gadgets available for purchase or DIY construction.

3. Establish the schedule to candle your eggs.

The majority of chicken farmers double-candle their eggs. After 6-8 days in the incubator, they will be able to eat solid food for the first time. If you are using eggs from a different breed, you may have to wait longer for the initial candling. The darker the egg, the more difficult it is to see the early stages of development against the dark shell. A week after the first candling, the second one will take place. During this second candling, you’ll look for any eggs that stopped growing during the previous one or for any that you weren’t sure about. Make a note of any eggs after the second candling that you aren’t sure about and re-candle them later. After 14 days, it’s recommended not to handle the eggs.

Steps in Candling Eggs

1. Place the light on the egg.

Candling should only be performed in a pitch-black environment. Cool-Lite testers can be used to see if an egg’s air sac is developing at its bigger end. The best view of the inside of the egg will come from a slightly rotated seal.

2. Identify the “winners.”

Successfully grown embryos are declared the winners. Look for a white network of blood vessels to see if the egg is a winner. The embryo is seen as a dark outline in the middle of the blood vessels. You might even catch a glimpse of the embryo’s dark eyes or catch a little movement of the embryo itself. Both of these are indications that the egg is going to be a winner.

3. Identify your “quitters.”

Quitters are embryos whose development has stopped at some point in the process of incubation. In order to identify a quitter, look for the blood ring, a distinct crimson circle on the inside of the shell. Blood veins separate from an embryo after it dies and rest against the eggshell’s inside, forming this ring. Dark red streaks inside the egg might also tell you whether a person is a quitter. A healthy embryo’s streaking can be misinterpreted for a quitter, therefore the blood ring is the best way to detect one.

4. Identify the “yolkers.”

Because they were not fertilized, yolkers will never develop into embryos. It will appear clear and undeveloped when viewed via a candle. It’ll be lit up. There are no blood vessels, no black embryo, and no blood ring. Putting the eggs in the incubator will make them look just like they did when you candled them first.

5. Toss out the “yolkers” and the “quitters.”

In order to avoid rotting eggs, never put them back in the incubator after determining whether or not they are yolkers or quitters. In the event that you are unsure, return it to the incubator and check it again on day 14. Toss the egg if no indications of development are seen after several days.

Let us know what you think

Candling is a vital step, especially if you don’t want to deal with the stench of an exploded egg. If you follow these instructions, your incubator will always be free of contaminants… clean as possible in a warm, humid, and egg-filled environment

If so, have you ever had an egg burst in the incubator? When it comes to making candied eggs, what are your favorite tips and tricks? We want to hear from you!

Check out the Cool-Lite Tester on our website if you’re interested in the light mentioned in this post.

Day 11 - Dead Embry in Egg Candling - YouTube

When should you candle fertile hatching eggs

After 7 to 10 days in the incubator, it is preferable to use a candle to inspect the eggs. You should wait until after the first week of pregnancy since the embryo is quite vulnerable during this time. After around 7 days, you’ll be able to see more clearly what’s going on.

After 7 to 8 days in the incubator, this is what you should observe in a viable egg.

Simply flashing a bright light into the egg is all it takes to make it fertile by candling it. It’s a non-invasive way to check if an unhatched egg is still alive after it’s been cracked open.

To determine which of their chickens’ eggs are viable and will eventually hatch into baby chicks, poultry breeders employ candling. It is possible to identify if an egg has stopped growing after fertilization by using candling.

An egg’s interior is illuminated so that you may view what’s within and the state of development of an unhatched baby prior to hatching through the use of the candling process

Below, a candled egg.

Using a flash light is the most basic method of candling an egg; however, there are specialized tools available (e.g., a candling torch). On the seventh day of incubation, most of the work is completed.

Do not remove the egg from the incubator for longer than ten minutes at a time, and do not light the candles at the same time as you remove the eggs. To keep the eggs in the incubator, you should only light a few at a time.

In brief if the eggs you are looking at are:

  1. In brief if the eggs you are looking at are:
  2. If you’re looking for eggs that are:
  3. A single, eerie dark area. These should be discarded because they have died at the 8-day mark.
  4. A living embryo is inside if you can observe a spider’s web of blood veins within the egg. A chicken egg’s blood arteries are usually visible within the first three to ten days of incubation. Embryos take up most of the egg and appear as dark areas within the egg after 18 days of incubation. The egg’s interior can occasionally be seen to be moving.

To avoid contamination of the incubator, remove any damaged or leaking eggs from the incubator as soon as possible. Return the eggs to the incubator and resume the day 1-18 turning schedule after candling.

After 21 days, you can use a candle to see if the embryo is still alive in the eggs that haven’t hatched. If the eggs aren’t hatching, you’ll need to figure out what’s going on.

When is the best time to candle eggs to check they are fertile?

The ideal time to check the fertility of an egg is 7 days after laying it. A period of incubation between 5 and 10 days is good. You can be extra cautious and take a 10-day break.

This is what you’ll see inside the shell if you’re lucky enough.

Even though you can see the embryo’s spider-like veins before this point, giving it another week will allow those who are doomed to pass away sooner. The blood ring eggs are here.

How many times should you candle eggs during incubation?

During incubation, you should light a candle three times.

  1. Make sure your eggs are healthy before placing them in the incubator.
  2. Once every seven to ten days to verify fertility and remove any clears that may have accumulated.
  3. At 16 days before hatching, yet another time. The newly hatched chicks may get smeared in goo from exploding eggs if you leave any dead or underdeveloped eggs on the nest.

An egg’s deformities can be spotted if it is candied before being placed in an incubator. For example, you might see if the egg was missing its yolk, fractured or had a damaged air sac.

At some point, embryos stop developing. Early dead eggs can be removed by candling the eggs at the 7-day mark.

You’ll be able to get rid of any latecomers by candling the day before pipping begins.

Does candling hurt the eggs?

No, however it can happen if you take too long or don’t pay attention. When an egg is exposed to the cold outside of the incubator for an extended period of time, it can die.

If you’re dealing with a huge quantity of eggs, this can be an issue.

To reduce the risk of breaking or damaging a candle egg, reduce the number of candles you use. To prevent this, place soft towels under your work area.

How early can you candle eggs?

Within 24 hours of the commencement of incubation, you can watch the embryo’s development using a white shelled egg and a powerful enough light.

This page provides a day-by-day breakdown of how the eggs develop during incubation.

At this stage, it’s challenging, and not every egg that starts will make it all the way to the end. During the early stages of development, the embryo is particularly vulnerable to harm, as the membranes and freshly formed capillaries of the eggs are particularly fragile.

Is there any way to candle very dark eggs?

I measure the size of the air sack on my Marans eggs, and incubate one or two light eggs with them to compare air sack size to.

Can you candle eggs with a smartphone torch?

For comparison, I incubate one or two light eggs alongside my Marans eggs, and measure the air sack’s size.

Below: A smartphone torch is used to light an egg.

To use a smartphone torch to ignite an egg, place the phone face down on a flat surface and switch on the light. Hold the egg up to the light source. If you have a phone cover on, you can rest the egg in a groove, which makes this trick even more effective!

When is it too late to candle fertile hatching eggs?

After the rest of the eggs have started to prick, it is too late to use a candle. After pipping, the humidity in the incubator will be affected, which may cause the chicks to be shrink-wrapped and die in their shells.

Can you candle eggs too often?

In fact, opening the incubator too frequently can cause temperature and humidity to fluctuate, making the eggs more susceptible to breaking or falling out, as well as introducing bacteria from your hands.

Should you candle fertile eggs before incubation?

Yes, you should prepare your eggs for incubation by lighting a candle. Cracks, the absence of yolks or multiple yolks, and damaged air sacs are all things to keep an eye out for.

Should you candle eggs under a broody hen?

If a mother is involved. I fail to see the point. I avoid using a brooding hen’s eggs for egg-candling since it can be disturbing. It’s preferable to wait for the hen to get off the eggs before inspecting them visually.


How often do you candle chicken eggs?

It’s not clear how many times a day an egg should be checked during incubation. Before placing your eggs in the incubator, check to see if they are still alive and undamaged with a candle three times. Check fertility and remove clears once every 7 to 10 days.

Can you candle eggs on day 3?

* After the third day, you should see anything if you candle your eggs every day. Your hands should be clean and dry at all times. The pores in the egg shell might become clogged with oil from your fingers, denying oxygen to the developing embryo. You may see the peep wriggling and kicking in his egg at around 8 days.

When can I candle duck eggs?

After around seven days of incubation, it is possible to candle the eggs. Candling has the advantage of removing any infertile or diseased eggs. In a dimly lit room, eggs are candled by shining a bright light into them. Veins leading from the inside of the egg to the air sac should be sought out.

Does candling hurt eggs?

And it’s safe to use candling on your eggs. Incubating eggs can be taken out of the incubator for a short period of time each day to be candled, just like a mother bird would. The size of the egg’s air sacs should rise throughout incubation as the egg’s liquid evaporates.

Can you candle eggs after 21 days?

Don’t give up hope if, after 21 days, there are still unhatched eggs. Give the eggs another day or two to see whether the timing or temperature has gone amiss. You should check on any unhatched eggs before throwing them away. Keep in mind that roosters are most likely to hatch from eggs.

How long does it take a chick to break out of an egg?

It’s quite normal for a chick to take up to 24 hours to emerge from the egg after it has pipped, and it’s not something to worry about. There are some instances where it can take as long as 24 hours, however this is not always the case.

Chicken Egg Candling: day 13 - YouTube

Conclusion on When to Candle Chicken Eggs

Because the way you handle chicken eggs is so important, you should take extra care to inspect them. When it comes to broiler production, candling may seem like a straightforward procedure, but there are a lot of things you need to know. When you know when to candle chicken eggs, you’ll be able to keep an eye on your chicken eggs in the most effective manner possible now.