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khewell

Alberta Slip Glaze

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I have been using lizella clay along with a local Georgia clay and dipping them in a Alberta slip glaze mix of

80% Alberta

20% 3134 Frit

I like the brown I get at a cone 6 but the problem is my pots leak.

I also get the same leakage when using another mix of the Alberta slip. I don't remember the exact mix.

The second glaze turns out smooth with a very high gloss and has a green tint to it.

How can I get my pottery to seal??

The clay I use doesn't start to melt until about a cone 12.

I also use a 25 min hold time.

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I have been using lizella clay along with a local Georgia clay and dipping them in a Alberta slip glaze mix of

80% Alberta

20% 3134 Frit

I like the brown I get at a cone 6 but the problem is my pots leak.

I also get the same leakage when using another mix of the Alberta slip. I don't remember the exact mix.

The second glaze turns out smooth with a very high gloss and has a green tint to it.

How can I get my pottery to seal??

The clay I use doesn't start to melt until about a cone 12.

I also use a 25 min hold time.

 

 

The problem is Lizella Red. The Alberta Glaze (and almost any other glaze) has enough crackle (even if too small to see) to leak and Lizella Red (without anything added to it) always leaks. It's a wonderful clay (BTW, I live in Lizella) and can be fired to several cones for different colors. I think it looks best at about cone 5 (see pics on my profile page). It matures at cone 9 and I've never seen it go to 12 with a hold without the pot melting. On Roger Jamisons' Woodfire site there are pics of Lizella Red Pots fired to cone 12 melted to the shelves. (A student put them in without telling anyone they were Lizella Red) But, even at maturity, or as close to it as you can get without melting the pot, it will still leak! Plus any cone above 7 turns Lizella Red from a beautiful red to a dark brown. You can solve the problem by adding talc. It doesn't take much and it darkens the clay. Experiment with talc or other chems to make Lizella leakproof. I can't be of much help because I never use it for anything that needs to be waterproof.

 

Jim

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