Why Does My Cast Iron Skillet Smell Like Metal?
You heat up your cast iron skillet and there it is: a sharp, metallic, "blood-like" or coin-like smell. Maybe your food even tastes a bit like it.
The usual reason: bare iron is exposed. Good cast iron is protected by seasoning, thin layers of oil baked onto the surface. When that layer wears thin or gets damaged, you're smelling (and tasting) the iron itself.
It's rarely dangerous, and it's very fixable.
The common causes
1. Thin or worn seasoning
New pans, pans that have been scrubbed hard, or pans that haven't been used much often have patchy seasoning. Gray or dull spots are a giveaway.
2. Cooking something acidic
Tomato sauce, wine, vinegar, citrus. Acidic foods, especially simmered for a long time, can strip seasoning and pull iron into the food. That's when you most often notice a metallic taste.
3. Soaking or dishwasher damage
Leaving cast iron to soak or putting it in the dishwasher can strip seasoning quickly.
4. Rust
Rust has its own sharp, metallic smell. Look for orange or reddish-brown spots.
5. A stripped or restored pan
If you've just stripped an old pan back to bare metal, it'll smell strongly metallic until it's re-seasoned.
Is it safe?
For most people, yes. A little iron in food isn't harmful, and cast iron is widely used. The metallic taste is more of a quality problem than a safety one.
Two sensible exceptions:
- Rust: don't cook on active rust. Remove it first (see below).
- If you have a medical condition that requires you to limit iron intake, ask your doctor about cooking regularly in cast iron.
How to fix it
If it's just thin seasoning:
- Wash with warm water and a little soap if needed (modern mild dish soap won't hurt seasoning).
- Dry completely, then put it on low heat for a few minutes to drive off moisture.
- Rub a very thin layer of cooking oil all over, inside and out. Then wipe it off as if you made a mistake. What's left is plenty.
- Heat it upside down in the oven at a high temperature (commonly around 450-500°F / 230-260°C) for about an hour. Put foil on the rack below to catch drips.
- Let it cool in the oven. Repeat 2-3 times for a solid layer.
If there's rust:
- Scrub the rust off with steel wool or a scrubber until you see gray metal.
- Wash, dry thoroughly, and follow the seasoning steps above immediately. Bare iron rusts quickly.
Then cook fatty foods for a while. Frying, searing, cornbread and roasted vegetables with oil all build seasoning naturally. Hold off on long-simmered tomato sauces until the seasoning is solid.
How to stop it coming back
- Dry your pan immediately after washing, ideally on the stove
- Wipe on a tiny bit of oil after each use
- Don't soak it or run it through the dishwasher
- Keep acidic cooking short, or use enameled cast iron for long simmers
- Store it dry, with the lid off or a paper towel inside if you stack pans
Metallic vs rancid: know the difference
- Metallic smell: bare iron or rust. Fix the seasoning.
- Rancid, stale or "old oil" smell: too much oil left on the pan or old seasoning going off. Heat the pan to burn it off, or scrub and re-season with thinner layers.
FAQ
Why does my cast iron smell metallic?
Usually because the seasoning is thin or damaged and bare iron is exposed, or because of rust.
Is it safe to cook in cast iron that smells like metal?
Generally yes, but remove any rust first and rebuild the seasoning for better-tasting food.
Why does my food taste like metal from cast iron?
Often because acidic food stripped the seasoning or the pan's seasoning is thin.
How do I get rid of the metallic smell in cast iron?
Clean, dry thoroughly, and re-season with several thin layers of oil baked on at high heat.