3 ms·

It's a kind of siderotype, a iron-based (even if in this case the end result doesn't actually involve iron in the paper) photographic printing process. All the

• mikorym 7y ago
  That's interesting; is the use case professional photographers selling high quality prints?
  • frostburg 7y ago
    I think that in practice it's more a technique practiced by somewhat technically-obsessive advanced amateurs, but it's a valued process for high-end commercial prints, too. The process has beautiful gradation and extreme archivial resistance with correct paper choice (but despite what you might read about it it's not the absolute best at that, because platinum is a catalyst for reactions that you don't really want to happen in your print over long timespans - the best would be the even more niche chrysotype process). Personally I'm dialing in my approach to eventually make combination platinum / cyanotype prints (I use digital negatives, one of the issues with these alternative processes is that you can't enlarge, so they need either large format film or a digital intermediate).