The following glaze, Red Reserve (from Birk's "The Complete Potters
Companion"), is a smooth black in oxidation if even moderately thick. If
thin enough, it is a purplish red. It is food-safe (see my post today,
"saturated iron is safe"). It does interesting things over and under other
glazes.
Red Reserve (1280 C)
ball clay 26
quartz 26
feldspar 21
whiting 16
RIO 12
total 101
