I spent my last weekend learning how to make a wet collodion plate. Thanks to the il Conservatorio della Fotografia for the fantastic opportunity offered.
Here you can see some photos from the workshop.
Wet collodion
Francesco Arese Visconti PHOTOGRAPHY 
Wow, that is really cool. When were these 1st used and what followed to replace them? Or is this an art thing more than a photo thing? Either way, it looks fascinating!
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It is fascinating indeed! It was invented by Frederick Scott Archer in the XIX century. It is a photographic process (which can be used as a form of art, of course). It’s been replaced by the dry photographic precess with silver gelatine based negatives. You can find more info here: http://en.wikipedia.org/wiki/Collodion_process
I hope it helps!
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