I picked up a square cast iron pan at a garage sale. It was obviously used for a decoration and has a family name and logo stamped into the bottom of it. Is it safe to cook with?
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Not enough information to say, but if there's no rust there are no obvious reasons why not; you can heat it enough not to worry about bacteria and such.
There is no rust on it. I'll give it a try cooking on it. It is definitely rougher on the inside than my other cast iron skillet but I figured it was worth a dollar even it isn't great to cook in.