| http://www.w3.org/ns/prov#value | - On the USDA website under the heading ???Iridescent Color of Roast Beef???, this strange phenomenon is explained to be in fact perfectly natural and caused by iron and fat that exists in meats such as roast beef and processed ham.According to the USDA, when light hits a slice of meat it splits into colors like a rainbow due to the elements present in the meat and this is called a ???diffraction gr
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