I have an article on uranium toning in the Amateur Photographer Dictionary of Photography (1961). It has several recipes and also some notes on mixed copper and uranium toning. it does however say:
"The reputation for giving impermanent prints seems to have arisen because the final image is soluble in any alkaline solution, including ordinary tap-water. "
( Sowerby, A.L.M. (ed.) Dictionary of Photography: A Reference Book For Amateur and Professional Photographers (1961) London: Iliffe Books Ltd.)
It also gives a working method for Uranium printmaking, but doesn't note their permanence. It says they can be made by sensitising paper with 16% unranyl nitrate, and the addition of a 4% solution of eiher mercuric nitrate of copper sulphate has been recommended. Develop in either a 10% solution of pot ferri for reddish-brown tones, or a 5% solution of silver nitrate for a greyish image which can be toned.. You can also develop in a 1:500 solution of gold chloride brushed over the paper to give prurplish-black tones. After development, was in hydrochloric acid 1:80 and wash again thoroughly.
That's the gist of it. If you're still interested, i can scan the articles and bang them up on my webspace for you.
I agree that you'd need a compelling reason to want to print with uranium. But I'm not so quick to dismiss the novelty aspect. It would be kind of cool to have a couple of prints made this way. I'd probably hide them behind lead glass though
When I met Ed Buffaloe a couple of years ago he had a uranotype with him. It was a nice print, but for me the orange/red tone wasn't so appealing. I looked at it as more of a novelty type print than anything. I have no desire to mix uranium with my photography so I'll leave the uranotypes and uranium toning to you guys.
Searching my way to perplexion
From what I've read the danger with uranyl nitrate isn't radioactivity, since it seems to be made from depleted uranium and is lacking a large part of the radioactivity. The danger seems to be that the stuff is highly toxic and caustic, as well as potentially mutagenic and teratogenic. Since I'm lacking a suitable lab space it will be some time before I could potentially try this process. I'll start with Van Dyke and take it from there!
I first read about Uranium toning in about 2004 and had a single vision for using it. Lately, well it is just too late.
I thought about printing an image of a TV screen with an aerial photo of a truck pulling away from a building in a desert setting, on the outside surface of an aluminum tube clearly marked ALCOA, via liquid emulsion.
Probably it is better I just didn't do it.