Editing Platinum print (section)

== Patents ==
[[William Willis (inventor)|William Willis]] was the first to patent the platinotype process in 1873  (British Patent No. 2011, June 8, 1873),<ref name=TPP /> and again in 1878 and 1880, which he leveraged to gain commercial success in the manufacture of platinum papers sold through his Platinotype Company for [[Commercial photographer|professional]] and [[Amateur photography|amateur]] use.  He also developed the palladium process requiring palladiotype paper and a silver-platinum paper, [[Satista]].<ref name=encyclopedia>{{cite encyclopedia | encyclopedia = Encyclopedia of Nineteenth-Century Photography | volume=1 | section=A-I | year = 2008| editor1-last = Hannavy | editor1-first = John | publisher = Taylor and Francis Group, LLC | location = New York, NY | isbn = 978041597235-2 | url=http://home.fa.utl.pt/~cfig/Anima%E7%E3o%20e%20Cinema/Fotografia/Enciclopedia%20of%20the%2019th%20Century%20Photography.pdf | title=Encyclopedia of nineteenth-century photography: A-I, index }}</ref>

Willis introduced the "[[hot bath]]" method where a mixture of ferric oxalate and potassium chloroplatinate are coated onto paper which is then exposed through a negative and developed in a warm solution of potassium oxalate.<ref name=HPP>{{cite web|url=http://www.danesphoto.com/pt_history.html |title=History of the Platinum Print |publisher=Danesphoto.com |access-date=2013-07-28}}</ref>