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Found 5 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. Took some pots out of the kiln and noted pinholes in both the celadon (Amaco Sky) and satin matte (Amaco white) vases. This is one of my earliest glaze firings and I am curious as to the factors to investigate to better control this issue. Here is some data: 1. Both clay bodies are Sheffield 20231G clay 2. Bisque fired in my E23S L&L kiln (programmable) to Cone 06 (verified with actual cones as accurate). 3. These 2 examples were more than a year old before the glazes were applied. Wiped pots but NOT with damp sponge. Possible problem? 4. Applied 3 coats o
  3. Hello helpful potters! I need help with an 04 bisque firing schedule. I'm having problems with pinholing in the 266 Standard Ceramic cone 4-6 dark brown clay that I'm using. About 50% of the time I'm getting a few pinholes, generally on the bottom but also on the sides. When I slow glaze, my cone 5 witnesses goes all the way down and the 6s are at about 2:00. The glaze I'm using is Potters Choice for cone 5/6, 3 coats as suggested by Amaco Brent, and this problem is happening pretty much just on the 266 and not the lighter color clays I use. I know pinholing can be a symptom of
  4. I thought I would start a new subject line rather than continuing to hijack the other one. I am trying to learn how to do some basic fine tuning of my glaze firing. I am going to start by trying to correct a pinhole issue I am having with one of my more popular glazes. I think the problem is that the temperature is dropping too quickly once reached and "freezing" the glaze before it has time to smooth out and heal over. I have a Bartlett V6-CF controller on my Olympic Kiln and I glaze fire to cone 6. With help from people over on the other subject of firing schedules (thank you!) I read th
  5. I've been reading Clay and Glazes for the Potter by Daniel Rhodes as well as Mastering Cone 6 Glazes by Hesselberth. Reading these and watching my own firings got me to thinking... How long do thermocouples last? Mine has been fired 125 times. I think it's (I don't have my kiln log in front of me for exact numbers) 55 cone 04 slow bisque, 55 cone 6 slow glaze, 15 cone 05 fast glaze (transfers). And How do you know when your thermocouple is starting to have issues? In my last couple of firings I have had a couple of pieces develop pinholes. I'm trying to remedy this issue sinc
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