WI all Papal tiaras were made of papier-mâché?

Yes, and in a short period of time, it's a thin sliver of papier mâché and 2 kg of gold...

Well, several Popes after Pius VII used the latter's papier-mâché tiara because it was apparently more "comfortable" than the standard Papal tiara. So maybe the same applies here with each new Papal tiara.
 
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