Bubbles in glaze

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Post by 22 Crawford St. March 18th 2017, 10:38 pm

and what is this glaze called with bubbles?





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Bubbles in glaze Dscn7314
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Post by NaomiM March 18th 2017, 10:46 pm

Impure? Laughter
It happens. I don't think it has a name, and I've had new pieces from potters where I've assumed it was a gaze fault but apparently it's not - or at least it's accepted as just one of those things. Maybe it's impurities in the glaze or degassing from the clay body or underfiring?

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Post by 22 Crawford St. March 18th 2017, 10:57 pm

Ahh I assumed it was experimental or intentional but you think it may be underfire or something. Interesting.
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Post by NaomiM March 18th 2017, 11:05 pm

The lovely ragged bowl I have by Matthew Blakely has bubbles in the blue glaze. Maybe it's a trade off between firing to get the right colour vs firing to get a clear glaze?

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Post by NaomiM April 24th 2022, 3:21 am

Cross section of Ming Dynasty celadon glaze, which is typically full of bubbles, with white porcelain in the middle. So a function of the glaze rather than an error

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Post by NaomiM April 24th 2022, 3:52 am

Celadon glaze drips on a piece by Eddie Curtis, Potfest 

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Post by dantheman April 24th 2022, 9:28 am

bubbles are usually the result of an excessively thick application of glaze  
Sometimes, however, these faults can be due to overfiring or to the use of soluble fluxes in the glazes
In Crawford's case,I would say glaze had pooled around the base of the neck, possibly resting in a dip

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Post by 22 Crawford St. April 24th 2022, 12:37 pm

Well they do pool but if you look at third photo of mine it's essentially all over bubbles. Possibly more where glaze is thicker? The odd thing is you don't really notice it until you look closely.

On another note I bought a John Bew (Odney Pottery) piece and it did something very unusual also. He had underglaze it with blues then clear glaze on top but mixed more pigment in a layer on top. When the light hits it right it glows! Essential backlighting the top glaze. Only happens when the sun is on it. It comes to life. I think Ray Finch did this and I saw a piece on eb but did not win it, bastard other bidders!

https://www.20thcenturyforum.com/t15379-john-bew-frank-spindler-odney-pottery-cookham-berks?highlight=odney
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Post by NaomiM April 24th 2022, 2:21 pm

This is a candlestick that Dylan Bowen refired because of bubbles in the glaze (I saw some single fired ones too, with the bubbles), and they're turned into a bluish opal like effect on the surface

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Post by 22 Crawford St. April 24th 2022, 3:28 pm

I did not know they could refire pieces. I suppose they need to get the temperature right
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Post by NaomiM April 24th 2022, 3:35 pm

Doug Fitch once said that half the pots coming out of his wood fired kiln may need to be refired because they were sitting in parts of the kiln which were too cool. But the alternative is having half the pots over cooked, which then can’t be refired


Last edited by NaomiM on April 24th 2022, 3:57 pm; edited 1 time in total

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Post by NaomiM April 24th 2022, 3:39 pm

Detail on Matthew Blakely’s ragged celadon bowl



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Post by 22 Crawford St. April 24th 2022, 6:22 pm

Yes that's exactly the same. Is that one celadon?
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Post by NaomiM April 24th 2022, 9:45 pm

I think so, although I don’t know the difference between celadon and ash glaze

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Post by Carol Taylor September 21st 2023, 5:36 pm

To me the bubbles WITHIN a glaze, looks fine, adds interest. BUBBLES that break on the glaze (like mine) are sharp and it mens I have overfired.
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