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I've heard of this practice. Surely wearing a hat from this era, even if it was processed with mercury, would be totally safe to wear? I'm interested in getting my hands on a hat earlier than what I'm familiar with. Why did we use mercury anyway?
Of course it's safe. The mercury was used in a pickling process during the making of the felt. It's not part of the composition of the felt.
Somewhere on the interweb, you can find a book called "Scientific Hat Making." I can't remember if it gets into the felting process or not, but may give some insight. I can't speak off the top of my head about the chemistry of the pickling, how it aide carating (sp?), or any of that, however.
Sent directly from my mind to yours.