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.