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TJR advanced
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In Topic: Recommended Glazes
Posted 17 May 2013
OffCenter, on 17 May 2013 - 08:45 AM, said:Mark C., on 17 May 2013 - 01:18 AM, said:Benzine, on 16 May 2013 - 10:10 PM, said:OffCenter, on 16 May 2013 - 09:49 PM, said:Brittany, on 16 May 2013 - 08:49 PM, said:OffCenter, on 16 May 2013 - 06:13 PM, said:Brittany, on 16 May 2013 - 06:02 PM, said: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.
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In Topic: Pricing Labels
Posted 17 May 2013
mmhpottery;
A well written question. I use those little sticky price tags from Staples/Office Depot. They are forever falling off. I have considered hang tags with some more personal info. I can see them for a mug or pitcher, but bowls would be a problem. People are always asking foe a bio, so the hang tag would serve that purpose. It's a dilemma, or maybe it's a conundrum.
TJR.
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In Topic: Glaze percentages
Posted 17 May 2013
Marcia is correct. Your glaze does add up to 100%
Bentonite keeps the glaze from settling as you have no clay in your glaze.
I agree with Jim. Put this glaze on a verticle test tile to see if it runs. Runny glazes ruin kiln shelves. Just sayin.
TJR. -
In Topic: North Star Portable 18 inch Portaroller Slabroller
Posted 16 May 2013
Terry;
We had this post a while back. To buy a slab roller or not. That is the question. Someone put out a generic Bailey clone and my pottery buddy bought it. Looks the same as a Bailey, only a different colour. I made slab trays and tiles all this last winter using a bakery rolling pin and two pieces of lath [thin wood strips].
Worked great I rolled on a canvas covered table top. Make sure you flip your slabs if using a rolling pin.Some people like the ease of the slab roller, but I would rather have the space to walk around.
TJR.
Please do not worry about asking questions. I have asked some doozers. I make the mistake of asking about Lizella clay TWICE ! I am still here to talk about it.
TJR.
Still trying to use up all these emoticons.
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In Topic: Will firing make imperfections more or less noticeable?
Posted 16 May 2013
Burnishing is a low fire technique, never meant to be fired higher than cone06.Neil and Jim are correct. It will burn off in higher temperatures.
TJR.
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Reading, camping, hiking, movies, my family, carpentry[amature]
gallery hopping, hanging with friends.Architecture.
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Yesterday, 11:06 AMgypsy
12 Apr 2013 - 10:03Denice
10 Jan 2013 - 14:01bciskepottery
05 Jan 2013 - 18:46Marcia Selsor
14 Jul 2012 - 08:37