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Per my limited experience, a hold at peak - adding heat work - may cause more fizzing. More heat work might clear things up for you, hmm. Are you firing same glazes, applied about same thickness, to other clays in same firing? Seeing same bubbling? In other words, any evidence that the problem is the clay vs. the glaze.

Looks like very small bubbles, which mostly heal over, but leave an orange peel look - excepting for the four (or so) larger holes, which may be a dry spot (where the glaze didn't wet the clay fully going on), or a larger chunk of something in the clay off gassing, or?

I found dropping and holding to help. No doubt you've already found links to Tony Hansen's articles, e.g. Drop-and-Soak Firing (digitalfire.com) and Glaze Bubbles (digitalfire.com); keep on it!

Keep good notes on each case...

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32 minutes ago, Hulk said:

Per my limited experience, a hold at peak - adding heat work - may cause more fizzing. More heat work might clear things up for you, hmm. Are you firing same glazes, applied about same thickness, to other clays in same firing? Seeing same bubbling? In other words, any evidence that the problem is the clay vs. the glaze.

Looks like very small bubbles, which mostly heal over, but leave an orange peel look - excepting for the four (or so) larger holes, which may be a dry spot (where the glaze didn't wet the clay fully going on), or a larger chunk of something in the clay off gassing, or?

I found dropping and holding to help. No doubt you've already found links to Tony Hansen's articles, e.g. Drop-and-Soak Firing (digitalfire.com) and Glaze Bubbles (digitalfire.com); keep on it!

Keep good notes on each case...

I was just answering you on my post!

Yep! I found that schedule and was surprised! is it a 27hour firing??

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I use Standard 710 (which is 266 with grog), single fire on a Skutt automatic slow fire setting to cone 5 with a 20 minute hold, no bisque at all, and I haven't had any problems. (I sure hope I'm not jinxing myself saying this!) I use commercial glazes from Amaco, Spectrum, and Coyote and most glazes come out beautiful on this clay.  Since I never bisque, I'm wondering the bloating you have is from some other issue. Maybe you're firing too hot? 

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12 hours ago, Callie Beller Diesel said:

@Kakes Titi has her location (below her avatar) listed as Ecuador. She likely won’t have access to North American clay bodies. Most clay bodies are only available regionally, because they’re not very cost effective to ship, and is usually easier to dig up closer to home.

I was responding to the original poster. But yes, you're right about regional clay availability.

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On 5/27/2021 at 5:54 AM, carissman said:

I use Steve Davis’s firing schedule on standard 266 and get no more bloating at glaze cone 5.  Recommended.

 

https://ceramicartsnetwork.org/daily/firing-techniques/electric-kiln-firing/bisque-firing-schedule-help-prevent-glaze-faults/

How long is that schedule?  (I'm not lazy, I'm at work! HA)

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