I hope the pictures post, because I'm having trouble with them.
I tried a two-tier baking arrangement. I put a regular pizza stone on the bottom, and firebrick splits on top. After baking four pies, I noticed that the cornmeal left on the firebrick splits was charred black, whereas the residual cornmeal on the pizza stone was brown. From this I concluded that the splits got hotter because they were closer to the top heating element.
Then I got a new Fibrament stone. I put it on the bottom, removed the firebrick splits, and moved my old pizza stone to the top rack. I expected that the cornmeal left on the top pizza stone would end up charred black, just as had happened with the firebrick splits.
The opposite happened! The residual cornmeal on the Fibrament stone was charred black; the residual cornmeal on the other pizza stone was brown. See pix.
What do you conclude from THAT? Does my pizza stone just not get as hot as the splits or the fibrament stone?