This is additive color. Red, green and blue are the primary colors of white light. All three colors will result in white, the absence of all three will produce black. When two primary colors of light are added together, you get a color that is brighter than either of its components.
MYTH: A blood spot inside the egg means the egg is fertile. FACT: A blood spot inside an egg can occur at various points in a hen's reproductive system as a result of a blood vessel rupturing. It can be the result of a genetic predisposition, a vitamin A deficiency, or a random event.
This fertile egg has been incubated for 4 days. This is the result of a fertile egg having been incubated for 21 days. UN-INCUBATED FERTILE EGG. A fertile egg that is never incubated will never contain an embryo and will never look like anything other than common breakfast food.