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High Bridge Pottery

Member Since 19 Feb 2013
Offline Last Active Yesterday, 11:36 AM
*****

Posts I've Made

In Topic: Does Magnesium Make Clay Gray? Talc Testing

24 September 2016 - 09:23 AM

I think it would be good to try a high Mg, high Fe and high Ti slip then do a triaxial blend. 


In Topic: Barrel Fired Ware Question

22 September 2016 - 01:27 PM

Only a guess but maybe something they use to waterproof concrete would work?


In Topic: Flux Formula Limits For Porcelain

21 September 2016 - 04:31 PM

I have tried to share parts of this documentary before and failed. Let's see.

 

At 10:30 there is a interesting animation firing porcelain on the inside, lots of liquid phase. I agree that you could be putting too much weight into gassy KNaO. Surely most of it is staying in the clay body or glaze? 

 

Good documentary.

 


In Topic: Coe Study / Clay

19 September 2016 - 05:01 PM

I figured it out, the clay biz stuck the 9 on upside down. Should read cone 9-10.

 

Is 3.5-4% flux acceptable for a cone 9-10 body?

 

Not sure I am following along with the unfired and glassy matrix causing COE issues. Isn't that what clay is, a crystaly glassy mess? Melted and raw bits.


In Topic: Clear Glaze Forms Bubbles At Edges & Rims

19 September 2016 - 04:36 PM

The pink UG with glaze look pretty good to me, also the blue is not too bad but the slip and stain is going lumpy. I still think you want to drop to 20-25% stain and see if that helps.

The brushed glaze looks better but I think that's because the application is different.

 

The only time I have seen something similar is when I painted a kiln full of pottery with pure stain on the surface then glazed over and they all bubbled like crazy.

 

What temperature are you firing to? Any lumps in the slip/glaze?

 

Not sure about the brush on blue glaze, looks weird on one and ok on the other.