I can't believe I forgot that!
So far, I do van Dyke.
I also do salt prints, but my silver nitrate is at least the right chemical...
I intend to try Pd sometime in the future, I even have the Palladium already. I also have a 5x7 neg I think will look good in (cyanotype) blue.
But for the moment, my main concern is van Dyke - thus the ammoniumferricitrate.
As I mentioned, I have a degree in chemistry so making a ferrioxalate solution should be no problem. But the ammoniumferricitrate is a very poorly defined chemical with variable composition - besides, the only specifications I can find for "The good stuff" is "green". I can't synthesize "green"!