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Recommended Glazes


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#21 TJR

TJR

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Posted 20 May 2013 - 10:15 PM









Today I finished my first batch of pots for this month, but realized that the glazes are not a good match for the type of clay I am using. I use the red clay from Georgia, which just happens to be a bit coarse. It also just happens to be darkening the glazes and changing th outcomes of the pieces. Any suggestions on good types of glazes(store bought) for Georgian clay and good methods of applying the glazes evenly?

Thanks-
Brittany


What you call "Georgian clay" is most likely Lizella Clay (aka Lizella Red). It's a beautiful clay but it will leak no matter how high you fire it or how many glazes you put on it. It should never be used for anything expected to hold liquids. It looks good fired to earthenware temps and takes low fire glazes well but is weak and really leaks badly at low temps. It should be fired to cone 6 but will still leak (but slowly) unless you add lots of Neph Sy to it. It should be bisqued high (~04+) because it has lots of impurities in it (dug from a swamp a few miles from my house) that will gas off during the glaze firing and ruin the glaze if the organics have not been burned off completely during the bisque. It's hard to find a glaze that works well on it because of the high iron content. Use an opaque glaze that can be applied thick without running. The holder in the cup & holder in this picture is Lizella Red. http://ceramicartsda...wimage&img=2584

Jim


What clay would you recommend for a beginner interested in making pieces that may hold water, but is low-fire ( cone 05-06)?


I'd recommend that if you intend to make pots that hold liquids that you fire higher. Any clay properly formulated for cone 6 should not leak at all even with no glaze on it. There are lots of good cone 6 clays from translucent porcelain to rich red-browns to black. And you will find plenty of beautiful glazes in that range. If you decide to to do low-fire, then I think you have to depend on glazes that fit the clay body so well that the leaking is almost eliminated so that a mug works as long as it is not left on a grand piano overnight. But, somebody else can probably address that better than me because, even though I love the majolica work of low-fire potters like Linda Arbuckle and Jill Manos, I've never done it and don't know how they seal majolica that holds liquids.

Jim


Jim, whenever the discussion revolves around making usable wares, that hold water, you always mention the grand piano thing. Is there a back story, or are you just going on the assumption, that everyone owns a grand piano.....I mean I do, but that's just because I'm well to do.....*Polishes monocle*


I think its a baby Grand with the bench made from splash pans.
Mark


Oh god, now Mark is a comedian!

Jim

Jim;
That's how I ruined my grand piano. Had to buy another one. What does one do with two grand pianos. One has a horrible white spot on the varnish.
TJR.Posted Image


I figured you'd chime in on this! BTW, I don't know if you saw it in another thread but I apologized for being a bit curt with you over something you asked but I forget what it was now.

Jim

Jim;
I asked what Lizella clay was. In the clay and glazes technical section. I went back and read your answer. Beleive it or not, I am not always on here. Apology accepted, but not required.
TJR.




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