Question about Ovens
It's from the cardboard of the pizza box - the heat has dried it and it has started to disintegrate, releasing all kind of chemicals and that fine powder (cellulose fibers). This is why heating recycled cardboard is strongly discouraged.
No, the self cleaning would generate a dark ashy deposit and dull the walls, not what you describe. Most likely the chemicals from the cardboard and the pizza have reacted in some unusual way with the leftovers from the self-clean.
Just bad luck so deny, deny, deny.
Posted on Sep 14, 2010
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Posted on Jan 02, 2017
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