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5 min read

Why we only fire forty pieces at a time

Our kiln could hold twice as much. Here is why we leave half of it empty, and what that does to the glaze.

Portrait of a grey-haired potter working in a dark studio

Mara Ketaro

Founder & potter

Glowing kiln opening in a dark ceramics workshop

Our kiln holds about eighty pieces if you pack it tight. We never do. Every firing carries forty — and the empty space is the most important ingredient in the glaze.

Heat needs room to move

Ash and celadon glazes change colour depending on how flame and air travel around them. Pack the shelves and the pieces in the middle come out dull and grey. Leave space and every pot gets the same slow, even breath of heat.

Glowing kiln opening in a dark ceramics workshop

Forty is the number where every piece still gets the same kiln.

It also means we can number every piece, check every foot and know exactly which batch your cup came from. If anything ever goes wrong, we know where to look.

Letters from the kiln

One short letter when a new batch leaves the kiln — about six a year. First pick of every batch, never any noise.

Visit

Studio 4, 1120 SE Alder St, Portland, OR 97214

Thu–Sat, 11am–5pm

Ketaro

© 2026 Ketaro Studio · Made slowly in Portland, Oregon

© 2026 Ketaro Studio · Made slowly in Portland, Oregon

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