Does anyone use tetraflouroethane to top off their chemicals? I've been using it, only because I don't have another source of relatively non-reactive gas. The only thing I dont' know is if it has any effect on what I'm storing since nearly half of it always goes into solution. I imagine the only thing that could oxidize the developer is the flourine, but I seriously doubt thats happening. So does it just dissolve into solution and live happily ever after, or is it having some effect that I'm not aware of? I havn't noticed any loss of effectiveness in my solutions, but until recently I also havn't been very meticulous in the darkroom either.