@FreedomFarm13 Here's is a link to a post I did about it. Back in April 2019. I know I did a post on it in the hatching section around that time too but didn't get much feedback. It works best at day 5. Although you might catch it anywhere between day 4-6 depending on your temps.
Hold eggs vertical and move your candler from the very top to very bottom of the egg. the entire length of the egg. Look for banding or "candy corn effect" (FYI I made that up, it's not an official term). As you slowly move your light the egg will change from light to dark then back to light. If you keep the candler right around the middle you can see all 3 layers at the same time.
This is something that's made possible by changes to the yolk as the embryo develops. An unfertile egg will light up completely. Or some slight darkening around the yolk. However it stays pretty round and bright. You will not see any clear delineation or bands like in a developing egg. Once you know what you're looking for you can see it horizontally too. It's much easier to see it vertically at first.
First picture is the full candy corn effect with a bright light source in the middle of the egg. Second pic is light source at the top of the egg only. The last picture is some of the eggs from this hatch, Marans and Sexlink to show egg colors. Very dark and this technique works on all of them. Note there is no obvious veining visible.
https://www.backyardchickens.com/th...byc-easter-hatch-a-long.1291653/post-21183310
Hold eggs vertical and move your candler from the very top to very bottom of the egg. the entire length of the egg. Look for banding or "candy corn effect" (FYI I made that up, it's not an official term). As you slowly move your light the egg will change from light to dark then back to light. If you keep the candler right around the middle you can see all 3 layers at the same time.
This is something that's made possible by changes to the yolk as the embryo develops. An unfertile egg will light up completely. Or some slight darkening around the yolk. However it stays pretty round and bright. You will not see any clear delineation or bands like in a developing egg. Once you know what you're looking for you can see it horizontally too. It's much easier to see it vertically at first.
First picture is the full candy corn effect with a bright light source in the middle of the egg. Second pic is light source at the top of the egg only. The last picture is some of the eggs from this hatch, Marans and Sexlink to show egg colors. Very dark and this technique works on all of them. Note there is no obvious veining visible.
https://www.backyardchickens.com/th...byc-easter-hatch-a-long.1291653/post-21183310