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Found 10 results

  1. Hello, My white gloss glaze has recently started pinholing I believe. We have been using it for years with no issue. i initially started with the kiln it is firing to temp. We fire slow bisque and slow glaze programs to 06 and 6. I have tried bisquing to 04 with a hold on the end but the defect came back... I have tried a hold on the end of a glaze firing (20 minutes) with little improvement. We have tried the ware with this glaze in 3 different kilns all have the same problem especially on larger ware. We have also tried wiping down the ware lightly with a sponge on both
  2. Hello, I am a new member (and new to pottery in general) and have struggled to find the answer to the glaze defects I have been experiencing on previous posts in this forum. I am having trouble with pinholing/pitting/airbubbles (not sure exactly what to refer to it as). Most of my glazed pottery either has loads of little holes (this is especially bad with black underglaze topped with clear) or lots of tiny bubbles trapped beneath the surface. To provide a background, the clay I have been using is Scarva Earthstone ES5 Original White Stoneware Clay, which has a firing temperature of 1200
  3. Hi all. Am having trouble with pinholes. I am using some commercial glazes and one glaze I mixed up from a recipe I found online. I clean my pieces very well before I glaze. I allow to dry before glazing, and leave them covered until glazing. I believe maybe it could be my one glaze recipe, or perhaps it could be the firing. I rent a space and the owner does the firings. He will not let anyone else fire and he blames all defects on you or your pots. Any help is so much appreciated. I am attaching a photo of a bad example of a glaze with a pinhole I got this firing.
  4. So I brought my favorite glaze into class to show my teacher what I was going to do color tests on. Keep in mind she is not a glaze chemistry teacher but she is a very good at teaching throwing & hand building. She quickly pointed out that my favorite tile is full of pinholes. I was astonished. I could not see them at all. I actually thought she was pulling my chain but she was insistent and kept pointing and looking real close and saying "yup, they're there." I kind of wanted to poke her in the eye. I did not. After class, I went home and got my magnifying glass and a flashlight and did a
  5. Dear everyone, I am quite new to a slip casting technique. Have made several plaster molds for casting porcelain. And had some success, but recently I have noticed that some of the greenware gets tiny pinholes and then, (because some cups doesnt have it) there are SOMETIMES also pinholes on the glaze. If i got it right, those tiny pinholes are the result of air bubbles or pieces of dust in the casting slip, right? But i wonder, do those pinholes influence the glaze? I am a bit confused, because some of the porcelain cups are not having those pinholes on the glaze and some do have. The thi
  6. I have this heavy blisters and pinholes issue and I m doing the Bisque at cone 08 and glaze temperature is at cone 6 + 40 mins soak., Whats the reason behind this blisters and pinholes ? Is it a clay issue or its something to do with a glaze chemistry ?
  7. From the album: USB Images

    Pin-holing from high feldspar content in clay body.

    © TJA 11-2017

  8. From the album: Ceramics Fall 2016

    Turquoise stone and white matte ^6 ox on calico dark red clay. A couple very wonky vases that developed decent sized cracks from uneven drying, this was one of the first things I made after taking a hiatus of 3 years from clay, be gentle! I needed to keep a few unsatisfactory pieces to try my experiments. I am totally head over heals in love with the color combo, but am very sad all the pieces developed pin holes on them... I talked to the professor and she is going to go over how to avoid that next time and keep my work together as to have a more consistent firing.
  9. From the album: Ceramics Fall 2016

    Turquoise stone and white matte ^6 ox on bone white clay. A very wonky vase, this was one of the first three things I made after taking a hiatus of 3 years from clay, be gentle! I needed to keep a few unsatisfactory pieces to try my experiments. I am totally head over heals in love with the color combo, but am very sad all the pieces developed pin holes on them... I talked to the professor and she is going to go over how to avoid that next time and keep my work together as to have a more consistent firing.
  10. From the album: Ceramics Fall 2016

    Turquoise stone and white matte ^6 ox on bone white clay. A very wonky bowl, this was one of the first three things I made after taking a hiatus of 3 years from clay, be gentle! I needed to keep a few unsatisfactory pieces to try my experiments. Ended up loving the combo, but am very sad all the pieces developed pin holes on them... I talked to the professor and she is going to go over how to avoid that next time and keep my work together as to have a more consistent firing.
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