I have switched to a Redart based red burning low fire stoneware. You can see all my test data on an insight-live share here: http://goo.gl/DOd23J
What are these? The white body matures to less than 2% porosity at cone 03. The red: 4%. The white can also be used as a slip on the red and the red as a slip on the white. The glaze (it is column three on the above share) works on both. They are both really plastic. This is really cool, I cannot wait to get down to the lab tomorrow to trim and slip these.
L3685U - Cone 03 White Stoneware/Engobe
A white burning body with enough added frit to produce a cone 03 stoneware or white slip for use on a matching red stoneware.