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Ceallach

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About Ceallach

  • Rank
    Advanced Member

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  • Gender
    Female
  • Location
    SF Bay Area
  • Interests
    Potter, Sculptor, Mad Scientist

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  1. Ceallach

    Building a kiln

    Marcia, altitude in terms of above sea level? How does that increase....exponentially, linear? I am at 150 ft a.s.l, so i think that makes it a non-issue. But forced air makes it seem doable.
  2. Ceallach

    Porcelain Clay Bodies

    Interesting...i checked....there are high alumina porcelain bodies but they are used for refractory porcelain....think spark plugs, crucibles, things that need ti resist strong alkalis, acids, and molten metals. Every time I think I have a good bead on things, there's something else to learn. I love it! Pres, thanks for whooshing this to a better place.
  3. Ceallach

    Porcelain Clay Bodies

    Tell me more. Porcelains tend to be high alumina bodies, so what ia the idea? Familar with the alumina for salt, but this is straight redux.
  4. Ceallach

    Porcelain Clay Bodies

    Leslie is in Richmond. I am in the east bay....i go to Claypeople for clay, they're 25 minutes from me outside of traffic. i have considered getting East Bay to formulate for me, but would like to sample myself first. They make the clays for a local studio, none of which i like. The porcelain that plucks I mentioned is theirs.
  5. Ceallach

    Porcelain Clay Bodies

    I know. In looking at this....i came across Geostone and remember using it eons ago.
  6. Ceallach

    Building a kiln

    Thanks, everyone. I was really looking for something that would bridge the gap between not having a kiln in my startup studio (by startup, i mean my own with firing), the money that is coming this year that will build out my studio, needing to fire some larger things (anywhere from 12-24", I would live to go taller but would need to go to sections past a certain point) on ideas that I have right now because my community studio kind of whined about something over 9 inches, which is tiny for me. In contrast, the local college studio, the main piece I did was over 48"....i measured the kilns and the old Alpine gabe me the best space...but tradeoffs in ramp speed vs ability of kiln to soak. I had some cracking but not detracting from the piece. I am probably going to build a raku kiln and see where that gets me. Engaging a kin builder is not an option for a number of reasons. Push comes to shove, I would build a kiln to suit, but that larger piece took 2 months to build and 12 hours to do the sgraffito, which was very tiring. I am content to do mugs and small bowls for awhile. It also allows me to try different surface designs and treatments.
  7. I had something similar happen with two 19b platters, and it made me want to cry....mine did not go clean through though. I did some reading in old books and found some sections about different kinds of cracks. Radial cracks, like this, that go from rim to center without following the S-curve pattern point to drying problem. In my case, the platters took a ridiculous amount of time tobget to the point of being able to flip them. Weeks in the damp Cali winter. So the platter rim would harden first even though the rest was still very wet. In my case, the rim itself took a long time. It was at the studio, not at home, or I would have been able to leave it open to dry. Going forward, i plan to get some Hydrobats ti ease the drying thing. In my mind, the cracks are from pressures as the clay shrinks and the clay being able to drag across the drying substrate. I have a clear intuitive picture of how this would work in my mind and can't think of any common thing to use as an analogy. I went ahead and glazed them on the off chance that the crack would not open more. I was not lucky. I am sitting on it to decide if i will do something with the cracks. They are neither functional, so I have opportunity HTH
  8. Ceallach

    Building a kiln

    Funny, I was actually thinking about talking to the local FD. I've dealt with them on other things and they have been very helpful. I was trying to decide how to handle the neighbors..... But of course, burning gets a bit more attention this year than previously, what with the fires and the rain. We're less than an hour from Sonoma, and were house bound for most of a week for the air....me especially since I have asthma.
  9. Ceallach

    Porcelain Clay Bodies

    Thanks, everyone. Next time I buy clay, I'll pick up some Babu and try it. I'm also going to try Geostone again....it's been decades, but I remember liking it. Not sure how it will be for my current work, but local supplier (IMCO is about 75 minutes from here, and the quarry price is $10 less than the closer suppliers.
  10. Ceallach

    Porcelain Clay Bodies

    Neil, I am on the west coast....none of my local suppliers carry Standard clays, and shipping on clay is exorbitant. We have coleman, frost, glacia, nara, daves in porcelain....out here, suppliers are Laguna, Quyle, Aardvark, IMCO. Clay planet also have a few pugged clays but I did not see a porcelain.
  11. Ceallach

    HOW OLD IS TOO OLD FOR A WHEEL?

    Or you could take the cash for a new controller and pedal and buy a soldner pedal and controller and bypass the brent controller altogether. .
  12. Ceallach

    Building a kiln

    I am looking to build a small kiln. Hers my story....i like tall and long things when I work by which i like to make them. My studio access to the larger kilns (higher ceiling is 56") is limited and will kind of run out. I have access to a community studio but the guy I talked to was not very accepting of anything large. (Large for him was a 12 inch vase, which is where my sections start). It got me thinking about what I can do in my community. ( we live in a 1500 sq ft house on 8000sqft with about a third of that on a hill. Our lot is large for the area, so the neighbors are close). I would ahppily do sawdust firings but we have more and more no burn days here in Cali each year and I honestly dont want to be the one to burn down the city. Then I got to thinking about a small raku kiln that might be taller than usual and could fire just a couple of pieces with propane without reduction. Then I started reading Kiln-Building with Space Age Materials and got excited about casting something with a similar profile but on its side (because tall things can be stood up or laid down...makes no never mind if you can deal with the glaze thing). But questions.....keep in mind I am still in the feasibility stage of the project :-D How tall should a chimney be compared to the kiln itself? Updraft/downdraft is not decided yet. If I use propane, will there be a strong smell or lots of smoke? How do you determine burner size? I would want to go at least cone 6, 10 if I can do it given the constraints that I have.
  13. Ceallach

    Porcelain Clay Bodies

    Also, the porcelain carves like feshly churned butter in a halcyon dream. So there's that. At the mimnet i only have ^10 access or I'd use Cassius at ^6 because it has the same carving character
  14. Ceallach

    Porcelain Clay Bodies

    Go big or go home. ^ 10 To clarify: I currently do a black and white ware....porcelain slip over black mountain and then carved and sgraffito. I like the contrast. I could and probably will do the black clay for a long time, but i need some visual relief if that makes sense. I also feel like art pots/sculpture will start with black and functional with white clay....partly because i like the blk mountain bare, love the color, but any clear glaze so far turns it gray which i dont like. The rich brown is luscious and very much about the clay being clay and not aomething else, if that makes sense. I am fine with porcelain, its not a new trick pony for me....i just dont have a favorite yet. Ive tried dave's which fought me, colemans is nice but not sure it's the One Porcelain for me. There is a local mix that plucks like a son of a buck so that's out. I have in the past used Danish White or Geostone with good results but the last time I used the DW i had lots of cracking and the stoneware just does not give me that contrast. Because I am looking for contrast in my work, I need the extreme of color. Ergo porcelain. I actually just got some small bowls out of the kiln. They were with Colemans, with colored slip from Mason stains. I dipped them half and half celadon and clear....i usually use a celadon but the clear was amazing on it and zinc free for better results. I am also doing a bit of alteration where I even pull the pot in places...so the porcelain needs to be a bit more je ne sais quoi. HTH
  15. I keep saying this to people on other sites.....that the best way to determine the impact of temperature on clay is to measure it with something that responds to heat and time like clay, and that only a cone can measure heat work accurately, because it really measures the absorption of heat by the clay over time. Honestly, I had worked with clay for decades before even hearing the term 'heat work', and then it made so much sense.
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