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Sea Winds

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  1. Using information people have suggested I just completed another test firing. This firing went to about Cone 5 (instead of Cone 6) and then temperature was dropped to 1950 degrees with a 30 minute soak, then cooled slowly at 150 degrees to 1400 to get the blueish colour from the Waterfall Brown. The photo shows two mugs. The one on the left was fired for the first time and no indication of blisters. The one on the right was a refire. Originally it had only one blister and after being fired a second time has many more. It seems that Cone 6 is too hot a temperature for this glaze/
  2. The blister is on the Celadon alone on that mug, so I am thinking if it is glaze related that it is the Celadon. The entire mug is glazed with the Celadon first. Once it dries the top one inch is dipped in the Waterfall Brown and as it is a runny glaze if flows down the mug. As a result there is no place on the mug where it is just the brown glaze.
  3. I have some pieces in the current firing that blistered so I will see how they turn out. I use witness cones 5, 6 and 7 and they are obviously in that order in the below photos The kiln is a Skutt 1027, 7 cubic feet. It fires hottest in the middle and coolest on the top. The cones below are all from the same firing. Based on the cones the Olive Green Celadon doesn't appear to be overfired if it is a true cone 6 glaze. (I know that for Floating Blue that it will turn out more greenish if I do a true Cone 6 firing in my kiln so I fire it to about 5 1/2 to get the blue I want)
  4. I don't think it relates to any one batch of clay. I have used many boxes of mid smooth stone with the same glazes over the last 6 months with some pieces having the blisters and others with no blisters. I have mixed new batches of glaze numerous times in case it is related to the glaze components. Going to try another glaze firing test today to see how it turns out.
  5. I am using Tuckers Mid Smooth Stone. Have used it with this glaze combo in the past and no issues. http://tuckerspotteryeshop.com/index.php/product/mid-smooth-stone/ The blisters do not always open to the clay body. See photo below which has tiny bumps where blister looks like it is starting to form.
  6. I am using a combination of glazes, Olive Green Celadon and Waterfall Brown, to get the effect I like on some of my work. Unfortunately I am running into a blistering issue more times than not which ruins the piece. Check out the image below. These are Cone 6 glazes and I have tried changing the temperature for the bisque firing as well as making changes to the glaze firing. The most recent changes to the glaze firing is to fire to Cone 6 then drop about 100 degrees (Farenheit) and hold the temperature for 30 minutes and then slow cool to 1,400 degrees. I have listed the recipes
  7. Thanks for all the valuable input. It is great to hear that surgery work successfully. I had an appointment with a physiotherapist and have some exercises for my hands. Will see how that goes and take one step at a time. Fortunately the arthritis is not advanced in other areas of my hand; just my left thumb joint at the base. The physiotherapist also has arthritis in her hand and is very knowledgeable on the issue.
  8. Thanks for the info on your surgery JohnnyK. It is reassuring to know that surgery can be so successful in helping the damaged joint. Right now I will take one step at a time and see what the physiotherapist has to say. Hopefully exercises and perhaps a brace of some sort can delay the progression of further problems. I can still work at the wheel without much difficulty but am concerned over the long term effects of pressure on the thumb joint combined with advancing arthritis in my hand. Of course some days are better than others.
  9. Another source is Joe Finch's Book which gives detailed construction info based on Fred Olsen's fast fire kiln.
  10. This topic makes for interesting reading. I have just been diagnosed with arthritis in my the base of my thumb joint. It is most noticeable on my left hand even though I am right handed. I think this is aggravated by centering clay using my left hand when pushing the coned clay down as I use that part of my left hand to do it. The joint at the base of my left thumb appears swollen all the time and is significantly larger than my right. There is a history of arthritis in my family as my mother has severe arthritis in her hands. While I have discomfort now it is not severe and I can do
  11. Sea Winds

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