Friday, October 23, 2015

BEADS


Yunomi with Beads glaze, John Britt, cone 6 stoneware with Terra sigillata, White liner and McGruder liner, fired E1 electric kiln, 2015.

Here is a group of yunomis that I fired with a glaze I made up for the Hudgens workshop in September. It was derived form :

Lichen cone 6
70 Nepheline Syenite
25 Light Magnesium Carbonate
  5 Ball Clay

This is  a nice lichen glaze that will go to beads if you over fire to cone 7, so I decided to adjust it a bit to be beads at cone 6. Most of these glazes derive from line blends of Magnesium carbonate and Nepheline Syenite (90/10. 80/20, 70/30 etc.)

So I took out 5 % magnesium carbonate to get it to melt more. (Even though magnesium is a flux it is not a very strong flux at cone 6 so it is causing lichen surface.) Then I wanted more fluxing so I added 5% Nepheline syenite. And as and added bit of insurance (since I didn't test it at all!) I took out 2% ball clay (refractory) and added 2% zinc oxide which is a strong flux.

So I came up with:

John's Beads cone 6
75 Nepheline Syenite
20 Light Magnesium Carbonate
  3 Ball clay
  2 Zinc Oxide

The only thing you need to to is watch the application. I had the Sp. Gr. at 125. And did two dips with some pouring.

Enjoy!





9 comments:

  1. Looks like they'd be fun to hold!!

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  2. Do you have a cone 10 version?

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  3. Are you putting a colored slip under it?

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  4. Skill and knowledge together in a nice package, inspiring!

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  5. here is my question, does this glaze actually stay on the surface after you apply it or does it flake and peel off?

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  6. Especially impressive since I saw firsthand at your workshop how tricky it is to get this glaze to look so wonderfully "wrong". Nice, as usual!!!

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  7. Application and specific gravity are essential. Not that hard though. Try this one. I don't have a cone 10 one but the principles are the same..so Sperry Crawl 50 NS 50% Mag Carb. So this is lichen at cone 10 down. You need more flux less refractory. So maybe 60 NS /40 Mag Carb? Or add some various other fluxes like Zn or frit or GB. 2-5%.

    Finally I don't have a colored slip but you could do that. I have a laterite terra sig which I quess could be called a colored slip?!

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