How to Care for Japanese Cast Iron
First identify the object
Japanese cast iron is not a single care category. An unlined tetsubin boils water, an enamelled teapot brews and serves tea, and cookware or decorative pieces may have different finishes again. Read the product instructions before applying heat, detergent or oil.
After use: empty and dry promptly
Do not leave water or tea standing in cast iron. Empty the object while it is still warm and dry the lid, spout, joints and exterior. A tetsubin can usually finish drying with its lid off using residual warmth; aggressive empty heating may damage the finish. Store only when completely dry and ventilated.
A tetsubin is not an enamelled teapot
A traditional unlined tetsubin is rinsed with water and should normally not be scrubbed or washed with detergent. Do not remove the mineral film that develops inside. An enamelled teapot, by contrast, must not be placed over direct heat, and its glass-like lining needs protection from impacts, metal tools and abrasives.
What should you do about rust?
A few rust spots on unlined iron do not necessarily mean the object is ruined. If the water becomes reddish, cloudy or distinctly metallic-smelling, follow the maker’s rust procedure; some advise simmering green tea so its tannins react with the iron. Avoid improvised chemical rust removers.
Calm use supports a long life
Avoid thermal shock, prolonged moisture and dishwashers. Use moderate heat only when the product is approved for a hob, and check that an induction zone suits the base. Dry trivets and decorative parts after wiping too. Good care is less about polishing than controlling water, heat and the finish.
Read next
- Oitomi – Japanese Cast Iron from the Nambu Region
- Osamu Saruyama – Japanese Design Between Tradition and Today
- Hinoki Wood – Scent, Properties and Japanese Craft
