I use Arches Platine from Bostick & Sullivan with pt/pd and develop with Ammonium Citrate 1:3 H2O FOR 1 1/2 minutes, hose off gently with the paper on a sheet of acrylic, three 5 minute baths in EDTA ( 2 table spoons + sodium sulfite 1 table spoon in 2 liters H2O face down) then gentle wash for 20 minutes. Air dry on screens. Try it , it should work -- it does for me.