I'm looking at getting some larger size paper to cut down for a pt/pd project I have in mind. While I would love to use the COT 320, $160 for 25 sheets of 20x24 is a bit out of my price range at this time.
Does anyone have a preference, and can you tell me why, between Platinotype and Socorro in the 23x29 size?
Another option is to try out Rives BFK. I've seen some great prints by Clay on BFK. I believe the trick was to single coat and then rehumidify before printing.
You're not going to find Socorro anywhere else. That was B&S's name for what was essentially Van Gelder Simili Japon. I understand that this paper is either no longer made or no longer available in the US.
Another economical choice is Fabriano Artistico Extra White 140 lb Hot Press. Try Jerry's for pricing. This paper needs to be pre-treated with a soak in 2% oxalic acid for 5 to 10 minutes.