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

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.

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.