> > Have you tried mixing the platinum and palladium solutions together while
> > warm, and then using it? I think you'll find you don't need to keep
> > heating the stuff up to use it.
>
> I'm not quite sure I follow you here, John. Did you mean to say mixing
> the Pt and Pd solutions together with the Ferric Oxalate, and then
> storing that?
>
> I get my Pt and Pd solutions in aqueous form from Bostick and Sullivan.
> Since the Pt solution is super-saturated I like to heat it to make sure
> any crytals which may have formed at room temperature are dissolved.
> Also, as I mentioned, the ratio of metals to ferric oxalate is related to
> the temperatures of the solutions.
>
> Could you elaborate a bit more on what you meant?
>
> David
>
Sure. It seems that when the palladium and platinum solutions are mixed
together and stored, they do not precipitate out, as the combined
solubility is more than the sum of its parts. This way you would have
your Pt/Pd solution (in whatever proportion you like) and a separate
Ferric Oxalate solution, which are combined in equal parts to coat.
Saves the time and the trouble of heating and the probability of evaporation.
I use pipettes instead of drops, so the issue of differing drop sizes
doesn't enter into my methodology.
I realize that every one that has a system that works is correct, I just
try to find the most efficient system that works the best.
Thanks for your info on the Platine paper and how you are using it.
John