Based on the search results, candling is a process used to determine the quality of an egg by using light. It is a common practice in the egg industry, where eggs are held up to a bright light to check for any defects such as cracks, blood spots, or other imperfections that may affect the quality of the egg. Candling is typically done in a dark room with a bright light source behind the egg, allowing the eggs contents to be seen more clearly.

The first two search results are not related to the egg industry and are inappropriate and offensive. It is important to be cautious when searching for information and to verify the credibility of the sources.