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According to Jane Ann Boles and Ronald Pegg (who wrote a guide called "Meat Color"):

Iridescence in Processed Meat Products

Iridescence is a common problem in sliced roast beef and ham products. The dominant color is frequently green and consumers sometimes confuse this with green myoglobin pigments associated with microbial growth. [This] is produced by a combination of the angle of incidence of the light on the muscle fibers and the wetness of the surface. If the fibers are pulled slightly out of alignment during slicing, the light strikes the fiber at an angle scattering light which appears as the rainbow or greenish color on the surface of the meat.

Source: Boles: Sandwich meat's green sheen, Improbable.com

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