DASS Special Sauce and Stone Paper. I am not sure where Mary got hers, but I ordered some from Etsy. What this photo can't show is how translucent the image is on that paper, it looks like it is floating on it. I think the surface of the image is a bit "soft" or fragile still, and I am thinking that I may frame it but will for sure use a mat to keep the glass off it.
Overall, though, it is one of my favorites.