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Showing results for tags 'glaze defects'.
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
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
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 ?