Has anyone tried making cyanotypes on tracing paper or tracing vellum? I was at the store getting my usual cyanotype paper and I saw a package of it and thought, "why not?" I coated a few pieces and they wrinkled quite a bit but flattened most of the way back out as they dried. I had to brush the solution on very, very quickly or just brushing would flatten those wrinkles and probably make creases. I expect them to flatten just fine with the negative under pressure. I just hope the paper holds up well enough to clear and wash. We'll see. If I can get it to work I expect a backlit cyanotype print to be quite beautiful.