Apart from the usual amount of care that we take of our home utensils, cast iron teapots will take up your attention to ensure that you do not get an overdose of iron from the rust.
The residue protects you from the rust
Each time you brew tea in cast iron teapots, you cause a thin film of residue to form along its inner walls. This residue is mostly made up of tannates of the various amino acids (tea has all 20 of them) that are found in tea. In a word, the residue inside your tea vessel contains a great deal of tannin. Because tannin is a powerful anti-rust substance, you should allow the residue in your teapot to accumulate. In that case, rust will simply be converted into iron tannate which is seen as a black-blue precipitate on the vessel's inner wall. Obviously, the more you brew tea in a specific teapot, the more protected you are against rust. Some people recommend rubbing the inner wall with olive oil and salt. That solution is fine if you don't mind the hint of olive oil in your tea and if you can reach far enough inside your cast iron teapots to do that. Remember some of them may be flattened in structure.
Traditionally, the residue in cast iron teapots have been allowed to accumulate. This was not only to heighten the savor of the tea preparations but just as equally to minimize the appearance of rust.
Pour out the liquid after you are done
After you are through with using cast iron teapots, clean and dry them up. Cleaning will be a simple matter of pouring out the remaining contents and showering it with water inside. Then you pour out the water and invert the cast iron teapots to let the rest of the liquid drip out. After that, to accelerate the drying process, apply a warm air blower to it. Detergents and other dish-washing compounds will remove the residue that you don't want to disturb. Just as in the case of olive oil, the scents that are typically used for those cleaning agents will just as effectively be retained on the walls of your pot and may possibly destroy the taste of your future blends. All the more so because those perfumes can be very pronounced and may have been mixed with oil.
Olive oil and salt with a fine grain is used to treat rust on the outside
To clean up rusted portions of the outside of the pot, you should rub it lightly with a piece of cloth that has been treated with olive oil which was impregnated with fine-grained salt. Using coarse salt grains may scratch the surface and spoil the texture of cast iron teapots.
Or you could just purchase cast iron teapots that have been glazed with porcelain
In order to avoid the issue of anti-rust treatments completely, you should just look for cast iron teapots that have been glazed with a coat of porcelain inside and out. The porcelain lining will prevent the metal from rusting by preventing extensive contact with oxidizing substances such as water and air. Then you need not worry about rust. The same rules for cleaning apply and you should leave as much residue as possible in the tea vessel to enhance its flavor. The olive oil and fine-grained salt process can't be used on precelainized cast iron teapots
Doc. No.:110-CF-ULT5-jn17xz
Add Asian style to your team time with a cast iron teapot and yixing teapot that's both functional and decorative.
Posted under green tea

