GifWhat causes the shiny rainbow appearance on some cured meats?

A natural phenomenon in cured meat, and some fresh meat, is the occurrence of iridecence or a rainbow appearance on the cut lean surface. Technically, this is referred to as birefringence. It is caused by the reflectance of light off the muscle proteins.

Muscles are arranged in strands that are bound together to form myofibrils. These in turn are bound together to form muscle fibers, which in turn form muscle bundels and finally the muscles. When the muscle is cut in a particular angle, exposing a cross section of myofilaments, the reflected light causes the rainbow effect.

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