What is starch sealing (medome)?

A

Starch sealing, known as medome in Japanese, uses rice starch or similar starches to fill tiny pores in the clay body, helping reduce the absorption of stains and odors. Not every piece needs this treatment; check the product's care instructions.

A common method is to place the piece in a pot, cover it with water saved from rinsing rice, and heat gently from room temperature. Simmer over low heat for about 20 minutes, then let it cool in the pot. Earthenware cooking pots can also be sealed by simmering rice-rinsing water in them or by cooking rice.

If one treatment does not seal the pores sufficiently, repeat it two or three times.

After sealing, let the piece cool, wash it thoroughly and dry it without stacking for at least half a day, or longer as needed. Storing it while moisture remains can cause mold or odors.