Yes — a rainbow or iridescent shine on deli ham is usually normal.
🌈 Why it happens
That shiny, rainbow effect is caused by light reflecting off the surface of the sliced meat. When ham is cut, the muscle fibers are exposed in thin layers. Light bends and scatters off those layers, creating an iridescent look — similar to how a CD or soap bubble reflects light.
This is called iridescence, and it’s common in:
- Ham
- Roast beef
- Corned beef
- Turkey
It’s more noticeable on freshly sliced, smooth cuts.
✅ When It’s Safe
If the ham:
- Smells normal (slightly salty/smoky)
- Feels moist but not slimy
- Has no sour odor
- Is within the use-by date
Then the rainbow sheen alone is not a sign of spoilage.
🚫 When to Toss It
Throw it out if you notice:
- Strong sour or ammonia smell
- Sticky or slimy texture
- Gray, green, or dull discoloration
- Mold spots
💡 Quick Test
Touch and smell are more reliable indicators than color alone.
If you’d like, tell me:
- How long it’s been open
- What the smell and texture are like
I can help you decide with more confidence.