What happens when I rebisque my pots?
We love when our international friends call in and today we have a great question from Colombia. The gang talk about making vitrified clay w...
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For Flux Sake
Matt and Rose Katz of the Ceramics Materials Workshop will answer your burning questions about clay and glaze. Each episode co-host Kathy King will present listener submitted questions that...
Episodes
20 of 126 episodesDoes it matter how fast my kiln cools?
We start today's episode with a trip to Materials Corner to talk about #1 Pottery Plaster. The gang also answer listener questions about con...
Can there be too much boron in a glaze?
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...
How do I reassure customers that I don't use lead?
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...
Why do cone 10 reduction glazes all look similar?
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 ques...
For Flux Sake Live in Boston!
For the first time ever the whole gang gathered in Boston for a live show at Harvard Ceramics. In this episode they answer listener question...
Do things ever explode in a glaze firing?
Today we have a special NCECA focused episode featuring questions recorded in person at this year's conference in Detroit. The gang answer q...
Do all glazes need Bentonite?
Today we have a special NCECA focused episode featuring questions recorded in person at this year's conference in Detroit. The gang answer q...
The Cost versus Reliability episode
Today the gang compares cost versus reliability when buying kilns and kiln shelves. The episode starts with a question about purchasing S-ty...
Can I add something to a commercial glaze to change its temperature?
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...
Why do layered glazes look different every time?
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 an...
Can I use ash from a volcano in my glaze?
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 b...
What materials should I buy to start mixing glazes?
We love questions from our educator friends. Today's episode starts with a question from a high school teacher who wondered what the best ma...
Is it best to use the medium or fast fire setting on my kiln?
Have you ever wondered what the firing rates are for the pre-programmed kiln schedules in modern kilns? In today's episode the gang talk abo...
Why are my plates cracking?
Unloading a kiln can be an emotional rollercoaster, especially if it's filled with a new ceramic form that gives you trouble. Today the gang...
What causes carbon coring in clays?
What is carbon coring, and should we care about it? The term is actually a misnomer, with the real culprit being iron, a common ingredient i...
Do I really need to sieve my glazes?
Glaze preparation is a necessary part of the ceramic process, but have you ever wondered why sieving glazes is important? Today the gang tal...
Should I make my own clay?
To start today's episode we take a ride to Materials Corner to talk about the situation with EPK, as well as, if there is an easy substitute...
Do kilns really need peep holes?
Have you ever wondered why kilns have peep holes? Today Matt, Rose, and Kathy debate the function and necessity of peep holes, while also ta...
Is there a difference between real and fake ash glazes?
Happy New Year! To start 2026 the gang answer listener questions about ash glazes, mixing brushing and dipping glazes, and how the particle...