Cone 6 oxidation:
Cordovan develops a deep, burgundy red color with a semi-gloss surface when fired to cone 5 or 6. Cordovan produces a brick or iron red on white and red midrange clay bodies.
Cone 10 reduction:
Color changes to a dark metallic gray with copper/black mottling.
TIP:
Two coats should be plenty to get deep red, opaque coverage; light glazers may need to add a third coat.