Originally Posted by philsweeney
The formula in Dick Arentz' book is a standard solution for palladium printing. It is based on the use of Palladium (II) Chloride.
The 20% solution I mention is the 20% Palladium Solution #3 of Bostick and Sullivan. or Sodium Chloropalladite.
Either will work for toning kallitype prints or for making palladium prints.