I have a problem which is driving me absolutely insane.
This problem has only just started popping up in the last few months. I am using earthenware clay and earthenware glazes, but the glaze just doesn't take correctly on 60% of the pieces. I am using a comercial claybody I have tried with a commercial white glaze and a glaze from a recipe and both give the same effect.
For this particular project I am using the clay to make casting slip (Which I have done in the past without issue).
I have been using this clay and glaze for years and never had a problem. I'm not doing anything different at all.
I bisque to 1075ºc and glaze to 1060ºc
I wash each piece of bisque to ensure dust/dirtfree surface before glazing, allowing it to dry for a few days in a warm spot. I also use surgical gloves to ensure I don't get finger grease on the pots before glazing.
I attach a photo of what's happening.
Any help would be much appreciated. Thanks.