Many people notice it the moment they open a pack of deli ham: a glossy, rainbow-like shimmer spreading across the slices. The shifting greens, purples, and blues can look metallic and unsettling, triggering worries about chemicals, bacteria, or spoilage. While some shrug it off as normal, others hesitate, unsure whether the meat is safe to eat. The truth sits between alarm and indifference, and understanding it requires looking beyond color alone.