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.
Ovulation lasts for 12 to 48 hours, but you are potentially fertile for up to seven days. (And maybe up to 10 days, according to the most optimistic studies.) This is because sperm can survive up to 5 days in the female reproductive tract. Ovulation is when an egg is released from an ovary. That egg survives for up to 48 hours before it can no longer be fertilized by sperm. This short time may be considered the ovulation period. However, your total fertile period is how long the egg is fertile and how long sperm can wait for the egg combined. This is known as your fertile window.