Pulled deli ham from the fridge and noticed a rainbow-like shine on the slices. Is that normal?

6. How Processing and Slicing Can Create That Shimmer
The processing and slicing methods used in preparing deli ham can enhance the iridescent effect. During processing, the meat is often sliced very thinly to achieve the desired texture and flavor. This thin slicing aligns the muscle fibers in such a way that light diffraction is maximized, resulting in the characteristic rainbow sheen.
Furthermore, the use of sharp, precise slicing tools ensures a clean cut, which can also contribute to the appearance of iridescence. The smoother the surface of the slice, the more likely it is to reflect light in a way that creates the shimmering effect.
7. Additives, Curing, and Why Some Hams Shine More
Certain additives and curing processes can influence the degree of iridescence observed in deli ham. For example, phosphates are often added to enhance the ham’s moisture retention and texture. These additives can alter the refractive properties of the meat, making the iridescent effect more pronounced.
The curing process itself, which involves the use of salt and nitrates, can also impact the meat’s surface structure, further enhancing light diffraction. Hams that are cured and smoked tend to have a more noticeable iridescent sheen due to the changes in their muscle fiber structure.
8. Storage Mistakes That Turn Harmless Shine Into Spoilage
Proper storage is crucial in preventing harmless iridescence from turning into spoilage. Deli ham should always be stored in the refrigerator at temperatures below 40°F (4°C) to slow bacterial growth. Using airtight containers or wrapping the ham tightly in plastic wrap can help maintain freshness and prevent contamination.