Kathy King, Rose Katz, Matt Katz

For Flux Sake

Arts EN ↓ 86 episodes

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.

Author

Kathy King, Rose Katz, Matt Katz

Category

Arts

Podcast website

www.forfluxsakepodcast.com

Latest episode

Jul 8, 2026

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Episodes

Why is this glaze so gloopy? 13.11.2024

Have you ever mixed a glaze with the correct amount of water, but it still seems gloopy and thick? If you have then you might need to add a dispersant to help solve this issue. The gang talk about using dispersants, and they answer a listener's question about the robustness of cone six versus cone ten. They also return to Materials Corner to talk about the discontinuation of a popular luster brand...

Why do pots get hot in the microwave? 04.11.2024

Have you ever noticed how some pots get really hot in the microwave? The gang talk about why this happens, and answer a listener question about coloring reclaimed slop glaze. They also talk about glow in the dark glazes and Rose's recent video about them on the CMW YouTube channel . Do you have questions or need advice on glazes? Drop us a line at ForFluxSakePodcast@gmail.com and you could be feat...

Fluxed Up with Brett Kern-Happy Halloween! 30.10.2024

Welcome to a very spooky edition of Fluxed Up with Brett Kern. Today we dive into the precarious world of ceramics filled with funny stories, studio mishaps, and the quest for the ever-elusive perfect glaze. Join us as Brett shares his journey with slip casting inflatable dinosaurs, using commercial glazes, and dealing with dunting after material changes. Tune in for a dose of humor, technical tip...

How can we help North Carolina? 23.10.2024

Have you wondered how you can help support artists affected by Hurricane Helene? This week's show is dedicated to sharing information and resources to assist the North Carolina clay community in rebuilding. The gang talks about assessing damage after a natural disaster, what supply chain issues we expect, and organizations needing support. If you'd like to contribute to disaster relief, please don...

Are cone 6 soda fired pots durable? 16.10.2024

Atmospheric firing is so much fun! What's not to like about a process where you get to spray soda into a flaming hot kiln. This week the gang talk about the durability of cone 6 soda fired pots, and the process for identifying mystery materials. They also take us behind the scenes to talk about what goes into making videos for the CMW YouTube chann el.   This week's episode features the following...

What's so special about a Bristol glaze? 09.10.2024

Have you heard of a Bristol glaze? This week on For Flux Sake the gang talk about the chemistry that makes these glazes work. They also discuss the crackle vs. crazing nomenclature, as well as the definition of porcelain. Do you have questions or need advice on glazes? Drop us a line at ForFluxSakePodcast@gmail.com and you could be featured on an upcoming show.   This week's episode features the f...

Fluxed Up with Lisa Orr 02.10.2024

Get ready for the wonderful and hilarious ceramic artist Lisa Orr! In this episode of our new For Flux Sake segment Fluxed Up , we dive into the precarious world of ceramics filled with personal stories, studio mishaps, and the ever-elusive perfect glaze. Join us as Lisa shares her journey with making low fired white wares, the influence red iron oxide has on aventurine glazes, and her recent rese...

Is that an Oolite? 25.09.2024

Have you ever heard of an Oolite? Find out more about this rare and interesting glaze precipitate on this week's episode. The gang also take a trip to materials corner to discuss new potassium feldspars that could replace Custer Feldspar, and answer a question about kiln venting. Do you have questions or need advice on glazes? Drop us a line at ForFluxSakePodcast@gmail.com and you could be feature...

The agony and ecstasy of Gillespie Borate 18.09.2024

Join us as the For Flux Sake gang dive into layering glazes. Have you ever noticed some glazes look better below others, but not on top? Find out why the order you apply them matters and more on this week's episode. We also have a surprise visit and a great question about Gillespie Borate from their #1 superfan Kookie Kane. Do you have questions or need advice on glazes? Drop us a line at ForFluxS...

Fluxed Up with Nick Sevigney 11.09.2024

Get ready for a wild ride in the studio with ceramic artist Nick Sevigney! In this episode of our new For Flux Sake segment Fluxed Up , we dive into the precarious world of ceramics filled with personal stories, studio mishaps, and the ever-elusive perfect glaze. Join us as Nick shares his journey from porcelain skepticism to newfound appreciation, the impact of the Custer Feldspar shortage, and r...

Shivering Sucks 04.09.2024

We're kicking off Season 4 of For Flux Sake with a bang—or should we say a "ping"? Matt, Rose, and Kathy are joined by producer Ben to unveil some exciting surprises awaiting you in the new season. We're firing up a conversation about shivering, crazing, and all the unpredictable quirks that come with ceramics. Why is your glaze flaking off? Could your firing cycle or even hand sanitizer be the cu...

Can I use paint on my ceramics? 31.07.2024

In Episode 72, the gang discuss using acrylic paints on pottery. You'll learn when it's safe to use acrylics and find out the effects of firing temperature on your cold-finished pieces. Also we'll get into pyrometric cones yet again and break down the difference between cones and temperature readings. Why are those last crucial 100 degrees Celsius so important? And finally, we're discussing the be...

Cone packs or cone plaques? 17.07.2024

We start today's episode learning why self-supporting cones are crucial for accurate firings, as well as everything you need to know about using cone plaques, from proper placement to reusability. We also delve deep into the world of firing temperatures talking about how to achieve vibrant colors at cone 10 while exploring the influence of alkaline earth fluxes on chemistry. Have you been thinking...

Does your water source affect glazes? 03.07.2024

Listen in as the gang visit Materials Corner to discuss the latest updates surrounding the loss of Custer. Matt also answers a question from a brewer about the source of water that you use in your glazes. The answer might surprise you! Also, Kathy and Rose share how they've both used CMC in glazes and Matt dives into the science behind it.   Today's episode is brought to you by Cornell Studio Supp...

Can ceramics be safely used for mixing hair dye? 19.06.2024

Listen to episode 69 where Matt, Rose, and Kathy discuss a listener's question about the use of ceramic bowls in the hair salon. Can ceramic be safely used for mixing hair dye? The team delves into the chemistry to determine if these bowls are a safe choice or a potential disaster.   Thinking about going green in the studio? The gang dives into listener concerns about sustainability in a large com...

What's the deal with Shino glazes? 05.06.2024

In episode 68, we're getting schooled on Shino glazes! Matt, Rose, and Kathy discuss some of the history, science, and stunning beauty of these unique glazes. The gang also takes a deep dive into the murky waters of water chemistry in glazes. Is it the secret ingredient or a total myth?  We'll also debunk some common misconceptions and explain why getting to know your specific gravity and viscosit...

Should I be afraid of manganese? 22.05.2024

Clay drama got you throwing shade? We've ALL been there! Join the For Flux Sake gang for episode 67 as we commiserate over inconsistent clay bodies and the woes of surprise firing results. We'll explore the limitations of trying to adjust an existing clay body and glaze to meet your needs and some of the many reasons why commercial clay bodies can vary from batch to batch. Plus, we'll shed some li...

Glaze Doctors Live from NCECA! 08.05.2024

Listen to Kathy, Rose, and Matt take your glaze concerns head-on in this fired-up live recording from the convention this year! The audience delivered rapid fire questions to the gang so get ready for a hodgepodge of hot glaze conundrums. From water content and adjusting a recipe, to cracking the code on crazing crystals and banishing hard pan pandemonium, they tackled every question that came the...

Electric Kiln 101 with Freddy Fredrickson pt. 2 24.04.2024

Listen to the final part of our conversation with the fantastic Freddy Fredrickson, former kiln master at Alfred University and founder of Fredrickson kilns. This episode will have you thinking beyond temperature when trying to get the most out of your kiln during your firings. Is cone 6 truly more energy-efficient than cone 10? Can your thermocouple be the silent hero of your firings?  Freddy has...

Electric Kiln 101 with Freddy Fredrickson pt. 1 10.04.2024

Join Matt as he dives deep into kilns with Freddy Frederickson, the legendary founder of Fredrickson Kiln Company. For over 30 years, Freddy wasn't just building kilns at The New York State College of Ceramics at Alfred University, he was perfecting the craft as their master kiln builder. In this first episode of our two-part interview, Freddy shares his remarkable journey. From the evolution of e...

Should I bisque higher than I glaze? 27.03.2024

Thanks to everyone who came out to our live taping at NCECA. We had a blast and look forward to airing that episode in a few weeks. Today on the show the gang talk about the effect of mold in clay, bisque firing higher than your glaze temperature, and the wild wild west of slip formulas. If you need assistance with a ceramic chemistry problem, send us a voice memo with your question to forfluxsake...

How can I make durable floor tiles? 13.03.2024

This episode of Flux Sake is a technical delight! Rose and Matt unpack the fascinating world of commercial clay body profiling with Ceramic Material Workshop's ongoing research project. They'll unpack the different tests used and what they reveal about a clay body's performance. Need to know the perfect clay body and glazes for your project? We've got you covered! The gang tackles listener questio...

Should I be afraid of lead leaching? 28.02.2024

The For Flux Sake crew is gearing up for NCECA! Tune in to find out their plans and where you can catch them live at the conference. They also dive deep into listener questions, tackling concerns about lead leaching in your kiln from past firings and fish tank safety. Can your ceramic pieces pose a hidden danger for you or your aquatic friends? Learn the facts with us and stay safe!   Got a perple...

What are those symbols on my glaze label? 14.02.2024

On today's episode the gang talk about deciphering the labels on your commercial glazes. They also answer listener questions about standard bisquing temperatures in the U.S., and if there is a toxicity risk when using lead glazed wares from the 19 th century. If you need assistance with a ceramic chemistry problem, send us a voice memo with your question to forfluxsakepodcast@gmail.com . Kathy, Ma...

How often can I recycle my clay? 31.01.2024

On today's episode the gang talk about recycling clay, knowing how hot a slip or glaze can be fired, and tips for running a community studio. If you need assistance with a ceramic chemistry problem, send us a voice memo with your question to forfluxsakepodcast@gmail.com .   As we head into the new year, we are having a comment drive. This is one of the easiest ways to support this show, and the be...

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