I just ran a test tile of "Anderson Ranch" Iron Saturate cone 10 glaze. Recipe from John Britt's book..."The Complete Guide to High Fire Glazes".
It was fired in my small gas kiln to cone 10.
This is a beautiful glaze...glossy, breaks brown to red. Here is the recipe:
Custer Feldspar 45
Bone Ash 12
Add: Red Iron Ox. 13.5