It's because of thin-film interference. It's the same phenomenon we see on oil floating on water, oil spots on a wet road or soap bubbles. read more
Ahhh light how much I love you! It probably acquired that shine due to light bouncing off of it in just the right way for constructive interference to occur. Enjoy your rainbow egg! read more
The rainbow on beef is similar to that found on a CD or DVD, while green has traditional been associated as a color of food gone bad through children's book like Green Eggs and Ham The rainbow effect is most commonly seen in cooked beef because this is typically sharply sliced against the grain of the muscle fiber, which, coupled with the moisture in it, creates an excellent surface for producing rainbows. read more