Courtney

Thank you Bill this info helps. In my mind I am thinking the the ball bearings analogy also allows air to circulate under the clay. Is this poignant. I know the air holds the heat differently than the shelf, so by having air passing through under the work, the work has a chance of having equal temp on top and bottom.

How much silica sand should I place between the kiln shelf and a large tile for bisque fire? I am trying to prevent cracking. Are there pros and cons for too much or too little? Thanks Courtney