| http://www.w3.org/ns/prov#value | - Accordingly, he spent countless hours in his studio creating prints with costly platinum salts ?? a process that had been mostly abandoned at the turn of the 20th century, but favored by Penn because of its glowing results. (Most photographic prints use a solution of silver on the paper rather than platinum.) He would paint the platinum solution on the paper himself to create the effects he sought
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