I have been trying to do some palladium prints on Rives BFK. This paper wants an acid pre-treat; I gave it a good 10-minute pre-bath in 5% Oxalic Acid. I'm still getting little blotchy areas
PtPdBlotchesRivesBFK.jpg

Is this something caused by needing to soak longer, or use more concentrated acid pre-bath, or is this a paper problem?