Speaking of rust, your cast iron teapot WILL develop rust in time and with use. Using water from a rusted iron kettle is safe for consumption. ... To safely remove rust from cast iron kettles, boil green oolong tea or green tea leaves in water and leave the concoction to cool off in the teapot.

How do you keep a cast iron teapot from rusting?

If rust bothers you, clean the rusted area with a soft brush, then fill the pot with used tea leaves and boiling water. Allow to sit for 20 minutes, discard and rinse. Tannic acid in the tea reacts with the rust and forms a natural seal, helping to prevent the reoccurrence of rust.

Is it safe to use a cast iron teapot?

The cast iron teapot is exclusively to brew tea, NEVER put it over a stove-top. The tea pot's enamel lining is fragile, and it could be damaged.