pam sinclair Posted April 9, 2013 Report Share Posted April 9, 2013 I am having problems off and on with a fine textural bubbling just under the surface of fired pieces. Using a Grolleg cone 4-6 porcelain fired with the schedule from Mastering Cone 6 Glazes. Ideas???? Link to comment Share on other sites More sharing options...
neilestrick Posted April 9, 2013 Report Share Posted April 9, 2013 Same glaze, different glazes, new batch, etc? Link to comment Share on other sites More sharing options...
pam sinclair Posted April 10, 2013 Author Report Share Posted April 10, 2013 Same glaze, different glazes, new batch, etc? It is the clay body itself just under the surface - under the glaze. The glaze is the majolica cone 6 from mastering cone 6 glazes. I fire to 2170 with a 20 minute soak and then fire down. Link to comment Share on other sites More sharing options...
neilestrick Posted April 10, 2013 Report Share Posted April 10, 2013 Sounds like bloating. The clay is over fired. Have you used cones to verify the heat work? 2170 may or may not be accurate with your thermocouple. The 20 minute hold adds about 1 cone. Link to comment Share on other sites More sharing options...
Marcia Selsor Posted April 10, 2013 Report Share Posted April 10, 2013 I agree with Neil, use some witness cones. It could also be over firing the glaze. I have used that glaze without any problem on a raku clay body fired to ^6 in electric. See what a witness cone tells you. Marcia Link to comment Share on other sites More sharing options...
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