Some time ago I purchased a slim volume titled "Vouloir c'est pouvoir" by Craig Koshyk. Despite its title it is in English and is about a way he foind to coat fixed out baryta paper for use with the Pt/Pd process. The details are interesting and the images he produces certainly made me look into using this paper for chrysotypes. Fixed out simply means taking sheets of baryta, which have been coated to use with an enlarger in a darkroom, and putting the unexposed sheets directly into a fixing solution. After looking around I found two manufacturers who produced uncoated papers which do not have any optical brightening agents - Hahnemühle and Innova. Since this was for experimental purposes I opted for the latter, which was the cheapest.

After following the instructions in Koshyk's book I got the feeling that his additional steps were not needed so made a print using the normal method of coating.

A few observations on this paper:

Baryta is a fairly thirsty paper so the coating amount needed is grater than I would normally use.

Coating the paper is odd in that you make four or five passes with the coating rod, as normal, but at that point the solution seems to suddenly soak into the paper and the rod suddenly drags when you try and do another pass.

This paper is very slow in terms of exposure times. For Artistico I would normally expect to expose the print to UV somewhere between 3 and 5 minutes. Baryta needs at least 15 minutes. Also, with Artistico at low RH I would only expose it until there was a faint image and then use the oxalic acid to further bring the image out. With baryta this does not work and all you would end up with is an underexposed final image.