Seasoned black patina and rolling mill: what they have in common

1. Step 1. Seasoned black patina — is part of — Cast-iron pan. Polymerized oil protects against rust and sticking.
2. Step 2. Cast-iron pan — is made of — Cast iron. Cast iron.
3. Step 3. Cast iron — uses — Blast furnace. Pig iron is smelted in a blast furnace.
4. Step 4. Blast furnace — is part of — Steel works. Blast furnaces.
5. Step 5. Steel works — has part — Rolling mill. Rolling mills.

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