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Blue Glaze Breaking Brown


emma_19

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Hi, 

 

I have seen a lovely duck egg blue glaze which breaks into brown patches where thin. The maker of the pot told me it is one glaze, not two layered glazes. I was wondering if anyone knows what kind of recipe/key ingredients I could be looking out for (cone 6) to give me similar effect? Thank you,

Emma 

 

post-66451-0-75730900-1459187763_thumb.jpg

post-66451-0-75730900-1459187763_thumb.jpg

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Nice looking glaze. I have been seeing some similar (ish) pinky colour where a white has been thin in  application with some dolomite in the glaze recipe. The purplebrown is interesting though. 

 

Maybe a mix of rutile/titanium, colbalt and zicron/tin for the added extras and a high calcium/magnesium base. Just a guess, also guess at reduction. Do you know how they are firing?

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To me it looks like 2 glazes, or a slip and a glaze. If you look at the bottom of the pot you can see the white, then a perfect line of dark, which makes me think it was some type of darker slip with iron in it, then just a regular matte glaze over the top of the slip to create that effect. I could be wrong, but it looks that way to me. Just a guess. I would assume after they dipped it in the blue or how ever they applied it, then took a sponge and rubbed it around a few places to get the difference in colors, or at least that is what I would do to get the look that it has around the bottom.

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Possibly variation in application/thickness of glaze.  I've used a magnesium matte called Turner's Beauty and can get a similar response depending on thickness of glaze.  A bottle held upside down and dipped into a bucket of glaze will get a thicker application on the top as that part was submerged longer in the glaze than the remainder of the bottle.  Or, if sprayed, did not apply an even coat at the bottom. 

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That's a beautiful glaze, indeed. But I don't know. Try doing a Google on ^6 matte blue glazes.

 

Turner's is a cone 10 glaze.  There is an Eggshell cone 6 recipe that produces a similar result; would need to change the colorants for blue.

 

http://ceramicartsdaily.org/ceramic-glaze-recipes/mid-range-glaze-recipes/eggshell-glaze-cone-6-oxidation/

Hey, that's a good idea. I think I will. 

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