Leopard Gecko Egg Candling
Candling is done in a dark room with the egg held on top of, or in front of a strong light. As the light penetrates the egg, it lights it up and makes it possible to observe the inside of the egg. Candling leopard gecko eggs should occur no sooner than 2 weeks after the egg has been laid. This will allow the embryo some time to develop, which is important if you wish to see anything.
There are commercially available egg-candlers on the market, but a mini mag flashlight is ideal.
Before you candle a leopard gecko egg, you want to ensure that the egg is marked with a pen on the "top". This will help prevent you from flipping the egg upside down and drowning the embryo.
Hold the light below or above the egg, with the marked side up, and the egg should light up. Once lit, look for some light pinkish coloring, as well as developing veins on the egg surface. These veins are carrying the nutrients to the embryo.
If the egg appears yellow or clear inside, and there are no veins present, repeat the candling again in another 2 weeks. If there are still no signs of veins or pink coloration after 4 weeks, there is a very high probability that the egg is not viable.
Egg Candling Image
The image above shows a fertile leopard gecko egg. There are very visible veins on this egg indicating that there is a developing embryo within.
Clicking the image above will increase the images size offering a larger view of the egg.