Sandy, when you say "the developer lasts indefinitely," are you referring to that used for Pt/Pd or Kallitype or both? My experience is that my Platinum developer lasts indefinitely (all I have to do is add some to recover volume lost over time), but my kallitype developer becomes so silver-saturated that it leaves a nasty stain I find impossible to clear (at least with Cranes Platinotype). Do you have a method to combat that problem?

And not to put too fine a point on it, but sodium citrate will develop some nasty mold if you let it sit, so "indefinitely" is definitely a relative term.