Some further ponderings about Pt/Pd toning......
Subsequently, I have found an older formula that is actually listed as 'Silver Substitution' using precious metal salts. In the listed formula they are using Cobalt Chloride and the text states that the other metal salts are not employed do to reasons of cost. In this formula there is a simultaneous mixing of 2 separate solutions at the time of toning right after development. The first solution is basically Cobalt Chloride & Sodium Citrate the second solution contains Potassium Ferricyanide. Does anyone foresee any obvious problems with substituting Potassium Chloroplatinite for the Cobalt Chloride? My usual concerns..... Explosions, invisible deadly gases, solutions that eat the flesh to the bone in a matter of seconds.
Oh ....and just curious why we were trying to do this substitution thing in the first place?