What clay are you using and how high the bisque?

Steve
Bath
UK

Hi Steve,

I dont know what stoneware clay they use at the college, but it is dark grey
in colour and fires to a v light grey. They bisque fire to 1100oC (which I
think is too high - personally).

The clay I use at home, is Potclays 1143M Draycott White and fire to 900oC -
I have not had any problems in the past firing at this temp.

Mmmm - I could try firing to 1000oc I suppose, and see what happens! But it
doesnt explain why the college are getting the same results - esp when they
fire at 1100oC.

Food for thought.
Thanks