Bridport Hill Pottery Posted March 18, 2022 Report Share Posted March 18, 2022 Significant mystery with my latest chun firing on a porcelain body. /\10 Usually a lovely deep blue. But in this firing the surface was creamy with maroon bubbles and pinholes. I broke one pot open to examine it. Application was thick, but that's somewhat deceptive here because in the closeup you can see the glaze actually was full of small bubbles -- like bone marrow or an Aero chocolate bar. Top shelf. Hot. Kiln was turned off w/ /\ 10 at 3 o'clock but that /\ had collapsed by the time the kiln was open. And pots were warm after 3 day cooling. Damper was closed right at the end of firing. Tight pack. Damper fully open for full oxidation for the last 3 hours (I usually keep it cranked in and c02 at .55. for prolonged reduction) Thoughts? I'm just mystified and super curious. No tragedy. But I don't want a repeat. Other glazes did not seem affected. This result appeared on all my pots with this normally reliable glaze. Link to comment Share on other sites More sharing options...
Callie Beller Diesel Posted March 18, 2022 Report Share Posted March 18, 2022 Can you share the recipe of this glaze? There’s a lot of things that can be happening here, but chemistry will let us say for sure. Link to comment Share on other sites More sharing options...
Rae Reich Posted March 19, 2022 Report Share Posted March 19, 2022 Looks like unreduced rutile. Is it over a red/copper glaze? Link to comment Share on other sites More sharing options...
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