Did this little experiment on vellum the other night. I had never painted on paper with oils, and always assumed I'd need some super high quality treated surface that would be expensive and a pain to deal with. Then I remembered vellum. although I usually have a harder time with smooth surfaces, I decided to give it a try. This is maybe a 3 or 4 hour study, which I painted mounted to a piece of cardboard tacked on the wall. the cardboard texture that came through was entirely unintentional, but I like it. maybe something to play around with in the future.