Rust on Le Creuset casserole
We are getting ready to move to the new house with our new induction cooktop and I'm trying to find a few pieces of my old collection that will be usable. When my dear MIL passed away 5 years ago I ended up with an 11" diameter, 5" high lidded Le Creuset casserole/dutch oven (?)that I have never used. It's a beautiful golden yellow but the top rim of the pot is a bit rusty and so is the bottom rim of the lid where it meets the pot rim. These areas are not enameled at all and don't appear as if they ever were as they are so uniform in looking like cast iron. Is is normal for these areas to appear like this and what can be done to clean it? Our new countertops are luce di luna quartzite and I'm afraid I'll put that rusting lid down and end up with a permanent rust ring on my new stone countertop. All advice is appreciated.