MaggieT Posted June 19, 2018 Report Share Posted June 19, 2018 I need help. I replaced all my elements, thermocouple, etc as I have been having terrible firings. I contacted my Kiln controller provider (Bartlett)as my kiln is firing 35 degrees lower than it should be. He suggested that I lower my the Cone Offset to 9010 and fire my glaze firing to fast glaze. It fired approximately 5 hours (Usually it fires for 7 hours). It reached the proper cone 6 but all my glazes (which are cone 6 glazes) are washed out - the colour is not there. Does anyone have any suggestions. Maggie P.S. The cone was a perfect 6 ....(7) wasn't even starting to bend. The plate in the picture is the colour that I usually get - nice blue. The mug is all washed out (it looks like the oxides have been burned out). Link to comment Share on other sites More sharing options...
Min Posted June 19, 2018 Report Share Posted June 19, 2018 Did you have cones in to verify it reached cone 6 and didn’t fire hotter? Did your glazes run more than usual? Pinholes, blisters? Change in glaze application? If you would post a picture of your pots that might help too. Welcome to the forum! Link to comment Share on other sites More sharing options...
MaggieT Posted June 19, 2018 Author Report Share Posted June 19, 2018 Yes, I had cones in - I have attached the files.... perfect 6. Glaze didn't run more than usual (actually, it was a great firing except for the fact that the colour was burned out). No pinholes, blisters etc. The glaze is the same one that I always use - no change in the application. Link to comment Share on other sites More sharing options...
JohnnyK Posted June 19, 2018 Report Share Posted June 19, 2018 Hi Maggie, welcome to the Forums...The fast firing could be the problem...not enough heatwork time to let the glazes to develop properly. You might try again, refiring the pieces with a 20 minute hold at the end, or go back to your original firing schedule with the 35 degree offset and see what happens. JohnnyK Link to comment Share on other sites More sharing options...
MaggieT Posted June 19, 2018 Author Report Share Posted June 19, 2018 Thanks Johnny, I was hoping to hear that. I love this glaze and hate to lose it! Maggie Link to comment Share on other sites More sharing options...
neilestrick Posted June 19, 2018 Report Share Posted June 19, 2018 Lots of glazes don't respond well to fast firings. It's not only that they're not spending as long in the kiln, but also that the kiln is going to cool a little fast since the bricks haven't had as long to absorb heat. I would go back to a slower firing. If the cone offset is correct, it should be correct at either speed. Link to comment Share on other sites More sharing options...
MaggieT Posted June 19, 2018 Author Report Share Posted June 19, 2018 Thanks Neil, That makes sense. I will go back to the slow glaze! Thanks, Maggie Link to comment Share on other sites More sharing options...
Mark C. Posted June 19, 2018 Report Share Posted June 19, 2018 Glazes respond to time and temperature .Not just a set point like cone 6 end point That said a cone 6 at 5 hours will look a lot different than a cone 6 at 9 hours. The glaze has no maturing time in a fast fire. You just found the out with your fast fire. Link to comment Share on other sites More sharing options...
MaggieT Posted June 20, 2018 Author Report Share Posted June 20, 2018 Thanks Mark i had it all wrong, I thought that the last fast firing had fired out the oxides, that's why there was no colour. Thanks for the explanation. Maggie Link to comment Share on other sites More sharing options...
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