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For Flux Sake

by Kathy King, Rose Katz, Matt Katz
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Latest episodes

  • Does it matter how fast my kiln cools?

    October 7, 2026 · 35 min

    We start today's episode with a trip to Materials Corner to talk about #1 Pottery Plaster. The gang also answer listener questions about converting celsius to fahrenheit and the cooling rates of kilns.  Have you checked out the new For…

  • Can there be too much boron in a glaze?

    September 9, 2026 · 40 min

    This week's show starts with a discussion of a recent viral ceramic video and the merits of a potter dipping pots in water immediately after glazing. The gang also answer listener questions about the amount of boron glazes, melting in cone…

  • How do I reassure customers that I don't use lead?

    September 2, 2026 · 37 min

    We start off season six of the podcast with a great question about customer service around ceramics. The gang answer a question from a paint-you-own pottery studio about reassuring customers that they don't use lead and using the full…

  • Why do cone 10 reduction glazes all look similar?

    August 12, 2026 · 42 min

    We start the episode with a quick trip to Materials Corner to hear good news about the mining of Red Art. The gang also answer listener questions about firing cone 6 clays to cone 10, finding vitrified commercial clays, and the aesthetic…

  • For Flux Sake Live in Boston!

    August 5, 2026 · 57 min

    For the first time ever the whole gang gathered in Boston for a live show at Harvard Ceramics. In this episode they answer listener questions about finding inspiration, altering glazes to fire hotter, dunting in plates, and the…

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  • Do things ever explode in a glaze firing?

    July 8, 2026 · 33 min

    Today we have a special NCECA focused episode featuring questions recorded in person at this year's conference in Detroit. The gang answer questions about explosions in a glaze firing, sanding bisque ware, and wheel cleaning. They also…

  • Do all glazes need Bentonite?

    July 1, 2026 · 44 min

    Today we have a special NCECA focused episode featuring questions recorded in person at this year's conference in Detroit. The gang answer questions about using hot wax, refiring in a community studio, particle packing for brushing glazes…

  • The cost versus reliability episode

    June 10, 2026 · 40 min

    Today the gang compares cost versus reliability when buying kilns and kiln shelves. The episode starts with a question about purchasing S-type thermocouples for new kilns and a discussion about preventing warping in cordierite kiln…

  • Can I add something to a commercial glaze to change its temperature?

    June 3, 2026 · 37 min

    To start today's episode the gang talk about their upcoming live show in Boston. We hope you will join us June 5th at the Harvard Ed Portal, where Kathy, Matt, Rose, and Producer Ben will be ready to answer your burning questions about…

  • Why do layered glazes look different every time?

    May 13, 2026 · 39 min

    Today we have a special Flux U episode where the gang dive deep into glaze application to answer a listener's question about the chemical and physical limitations of glaze layering. What seems like a simple topic turns out to be quite…

  • Can I use ash from a volcano in my glaze?

    May 6, 2026 · 29 min

    To start today's explosive episode a listener writes in wondering about using ash from Mt. St. Helens in a glaze. The gang also talk about best cleaning practices for keeping pets and children safe in a home studio, and methods for…

  • What materials should I buy to start mixing glazes?

    April 8, 2026 · 31 min

    We love questions from our educator friends. Today's episode starts with a question from a high school teacher who wondered what the best materials are for starting a glaze lab. The gang also answer a question about cleaning up clay with…

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About the show

Matt and Rose Katz of the Ceramics Materials Workshop and Kathy King of the Ceramics Program at Harvard University discuss listener questions about clay and glaze. This show will have you laughing and learning about the chemistry behind ceramics in no time.