I like to cook and I use black iron frying pans. Good for your health. They get dirty. Next time you fire, put one of them in the fire for a couple of minutes. They won’t be dirty anymore.
Here is something strange.
I have glazes that melt at about 1170C. in my wood kiln. They melt at about 1100C. in my kerosene kiln. Same glaze, same clay, same pyrometer and probe. I think it has something to do with pressure in the kiln, the kerosene kiln has more positive pressure, or the volume of the kiln. My noborigama is about 25 times larger than my kerosene kiln.