Handmade Japanese tableware behaves a little differently from mass-produced ceramics. This guide covers what to expect, which pieces benefit from pre-seasoning (and which do not need it), and how to use your pieces safely in the microwave and oven.
Uneven surfaces, colour differences and fine crackles in the glaze come from traditional kiln methods, and every piece is checked by the artisan before sale. Two items in the same colour will never be identical.
What to Expect from Handmade Pieces
Each piece varies slightly — uneven surfaces, small colour differences, and deliberate design features. These come from traditional kiln methods and are checked by the artisans before sale. They are signs of the making process, not flaws.
Some pieces feature kannyu (貫入), fine web-like crackles that form in the glaze as it cools. This is an intentional glazing technique, not damage.
Does Your Piece Need Pre-Seasoning?
Porcelain does not need pre-seasoning. It is fired until fully vitrified, so it does not absorb water or food. Wash it before first use and it is ready.
Pre-seasoning is only worth considering for porous pottery — earthenware and stoneware, pieces with kannyu crackle glaze, or pieces with unglazed areas such as the foot ring. These can absorb liquids through the clay, and acidic foods or mineral-rich water may cause gradual staining or colour change. Pre-seasoning slows this down.
It is still optional. Many owners let their pieces develop naturally and consider the change part of the character of the piece.
How to Pre-Season
For earthenware and crackle-glazed pieces:
- Choose a pot large enough to fully submerge the piece.
- Add 2 tablespoons of potato starch and enough water to cover it.
- Simmer on low heat for 20 minutes. Avoid medium or high heat.
- Turn off the heat and let the piece soak as it cools, for at least half a day.
- Wash and dry thoroughly.
Microwave and Oven Use
Most Japanese tableware is microwave-safe, but sudden temperature changes can crack it. If a piece is cold from the fridge, let it reach room temperature before microwaving. The same applies to oven use — heat gradually.
Pieces with gold or silver detailing must never go in the microwave. The metallic accents spark, and they are not oven safe either.
The full Japanese tableware collection — porcelain, stoneware and earthenware from kilns across Japan.
