Show overview
For Flux Sake has been publishing since 2022, and across the 4 years since has built a catalogue of 122 episodes, alongside 2 trailers or bonus episodes. That works out to roughly 75 hours of audio in total. Releases follow a fortnightly cadence, with the show now in its 5th season.
Episodes typically run thirty-five to sixty minutes — most land between 33 min and 40 min — and the run-time is fairly consistent across the catalogue. None of the episodes are flagged explicit by the publisher. It is catalogued as a EN-language Arts show.
The show is actively publishing — the most recent episode landed 2 weeks ago, with 16 episodes already out so far this year. Published by Ceramic Materials Workshop.
From the publisher
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.
Latest Episodes
View all 122 episodesWhy do cone 10 reduction glazes all look similar?
For Flux Sake Live in Boston!
Do things ever explode in a glaze firing?
Do all glazes need Bentonite?
The Cost versus Reliability episode
Can I add something to a commercial glaze to change its temperature?
Why do layered glazes look different every time?
Can I use ash from a volcano in my glaze?
What materials should I buy to start mixing glazes?
S5 Ep 126Is 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 about the differences between slow, medium, and fast on Bartlett controllers, and how the rates affect glaze outcomes. They also answer a listener question from Sweden about Boron sources and why some of them were recently banned. To start the episode Rose and Matt also announce their exciting new adventure into the world of commercial glaze - Ware Glaze. Have you checked out the new For Flux Sake Patreon? This is a great way to show your support and have access to discounted merch, live hangouts, and extra episodes. Head over to Patreon and sign up today. Today's episode is brought to you by Monkey Stuff, The Rosenfield Collection, Cornell Studio Supply, and Ceramic Materials Workshop's Making Glaze Make Sense. This week's episode features the following topics: Firing speed, Bartlett controller, borax, boron, Sweden
S5 Ep 125Why 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 answer a listener question about how to keep plates from cracking, the best temperature for firing terracotta, and if there is a vegan alternative for shellac. Do you have questions or need advice on glazes? Drop us a line at [email protected] and you could be featured on an upcoming show. Are you coming to NCECA? Look for Matt and Rose at the Ceramic Materials Workshop booth and Kathy at the Harvard Ceramic booth in the expo hall. Hope to see you there. Have you checked out the new For Flux Sake Patreon? This is a great way to show your support and have access to discounted merch, live hangouts, and extra episodes. Head over to Patreon and sign up today. Today's episode is brought to you by Monkey Stuff, The Rosenfield Collection, Cornell Studio Supply, and Ceramic Materials Workshop's Making Glaze Make Sense. This week's episode features the following topics: Compression, particle packing, terracotta, low fire, shellac
S5 Ep 124What 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 in reduction fired clays. Today the gang talk about the phenomenon along with questions about kiln safety, and best studio practices for kids and pets. Do you have questions or need advice on glazes? Drop us a line at [email protected] and you could be featured on an upcoming show. Are you coming to NCECA? Look for Matt and Rose at the Ceramic Materials Workshop booth and Kathy at the Harvard Ceramic booth in the expo hall. Hope to see you there. Have you checked out the new For Flux Sake Patreon? This is a great way to show your support and have access to discounted merch, live hangouts, and extra episodes. Head over to Patreon and sign up today. Today's episode is brought to you by Monkey Stuff, The Rosenfield Collection, Cornell Studio Supply, and Ceramic Materials Workshop's Making Glaze Make Sense. This week's episode features the following topics: Carbon coring, red iron oxide, black iron oxide, reduction, stoneware clay
S5 Ep 123Do 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 talk about various ways to prepare a glaze and why you might not need to sieve as much as you think. They also break down the idea of glazes that fire at multiple temperature ranges, and answer a listener's question about bubbling in a clear glaze. Do you have questions or need advice on glazes? Drop us a line at [email protected] and you could be featured on an upcoming show. Have you checked out the new For Flux Sake Patreon? This is a great way to show your support and have access to discounted merch, live hangouts, and extra episodes. Head over to Patreon and sign up today. Today's episode is brought to you by Monkey Stuff, The Rosenfield Collection, Cornell Studio Supply, and Ceramic Materials Workshop's Making Glaze Make Sense. This week's episode features the following topics: Sieving, bubbling, clear glaze, low fire, mid range, high fire
S5 Ep 122Should 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 to use in clay and glazes. The gang also answers a listener's questions about the feasibility of making your own clay. What equipment do you need? Does doing it yourself save money? Do you have questions or need advice on glazes? Drop us a line at [email protected] and you could be featured on an upcoming show. Have you checked out the new For Flux Sake Patreon? This is a great way to show your support and have access to discounted merch, live hangouts, and extra episodes. Head over to Patreon and sign up today. Today's episode is brought to you by Monkey Stuff, The Rosenfield Collection, Cornell Studio Supply, and Ceramic Materials Workshop's Making Glaze Make Sense. This week's episode features the following topics: EPK, Materials Corner, clay mixing, pug mill, Pioneer Kaolin, Georgia Kaolin
S5 Ep 121Do 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 tackling a question about glazing only the interior of a pot. They also start the episode talking about the research Kathy is doing at Harvard Ceramics into the historic use of graphite as a ceramic sealer. Do you have questions or need advice on glazes? Drop us a line at [email protected] and you could be featured on an upcoming show. Have you checked out the new For Flux Sake Patreon? This is a great way to show your support and have access to discounted merch, live hangouts, and extra episodes. Head over to Patreon and sign up today. Today's episode is brought to you by Monkey Stuff, The Rosenfield Collection, Cornell Studio Supply, and Ceramic Materials Workshop's Making Glaze Make Sense. This week's episode features the following topics: Peep hole, kiln venting, glaze tension, glaze compression, dunting, vitrification
S5 Ep 120Is 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 size of colorants affects glaze outcomes. They also begin the episode sharing stories about the highs and lows of art center holiday sales. Do you have questions or need advice on glazes? Drop us a line at [email protected] and you could be featured on an upcoming show. Have you checked out the new For Flux Sake Patreon? This is a great way to show your support and have access to discounted merch, live hangouts, and extra episodes. Head over to Patreon and sign up today. Today's episode is brought to you by Monkey Stuff, The Rosenfield Collection, Cornell Studio Supply, and Ceramic Materials Workshop's Making Glaze Make Sense. This week's episode features the following topics: Ash, Fake Ash, colorant, particle size, holiday sale, brushing glaze, dipping glaze
S5 Ep 119Gabriel Kline and Bill Collins on food safe glazes
Have you wondered what makes a glaze food safe? Today we are happy to welcome Gabriel Kline and Bill Collins to the show to talk about the topic, and their new book Amazing Glaze: Food Safe Recipes. They discuss the definition of food safety, how to test glazes, and what they learned after testing dozens of popular cone 6 and cone 10 recipes. Have you checked out the new For Flux Sake Patreon? This is a great way to show your support and have access to discounted merch, live hangouts, and extra episodes. Head over to Patreon and sign up today. Today's episode is brought to you by Monkey Stuff, The Rosenfield Collection, Cornell Studio Supply, and Ceramic Materials Workshop's Making Glaze Make Sense. This week's episode features the following topics: Food safety, leaching, crazing, cone 6, cone 10, shino, phase separation
S5 Ep 118Why is the last 200 degrees of the firing the most important?
Do you fire your kiln fast or slow? And does it really matter? Today the gang answer a few listener questions about the relationship between temperature, glaze melt, and vitrification. They also discuss a class of clays out of the UK that vitrify at low fire temperatures. Have you checked out the new For Flux Sake Patreon? This is a great way to show your support and have access to discounted merch, live hangouts, and extra episodes. Head over to Patreon and sign up today. Today's episode is brought to you by Monkey Stuff, The Rosenfield Collection, Cornell Studio Supply, and Ceramic Materials Workshop's Making Glaze Make Sense. This week's episode features the following topics: Firing rate, glaze melt, shino, cone 6, cone 8, vitrification
S5 Ep 117Why is my casting slip hard-panning?
Commercial casting slips are great for their convenience, but what do you do when your recipe hard-pans in the bucket? Today the gang talk about why hard-panning happens and how you can fix it. They also discuss making temp checks, the best bisque temp for commercial glazes, and the controversy around the sale of fake ceramic pigments. Have you checked out the new For Flux Sake Patreon? This is a great way to show your support and have access to discounted merch, live hangouts, and extra episodes. Head over to Patreon and sign up today. Today's episode is brought to you by Monkey Stuff, The Rosenfield Collection, Cornell Studio Supply, and Ceramic Materials Workshop's Making Glaze Make Sense. This week's episode features the following topics: Materials corner, hard-panning, casting slip, commercial glaze, temp checks,
S5 Ep 116Help my clay is plucking!
Have you ever had small pieces of an unglazed foot ring stick to a kiln shelf? This bummer of a phenomenon is called plucking, and today the gang talk about how and why it happens. They also answer a listener's question about increasing plasticity in halloysite porcelains and take a trip to Materials Corner to discuss the rumors swirling around EPK production. Do you have questions or need advice on glazes? Drop us a line at [email protected] and you could be featured on an upcoming show. Have you checked out the new For Flux Sake Patreon? This is a great way to show your support and have access to discounted merch, live hangouts, and extra episodes. Head over to Patreon and sign up today. Today's episode is brought to you by Monkey Stuff, The Rosenfield Collection, Cornell Studio Supply, and Ceramic Materials Workshop's Making Glaze Make Sense. This week's episode features the following topics: EPK, Materials corner, Halloysite, Frost porcelain, Southern Ice porcelain, Bentonite