The Platinum/Palladium Process pg 268-293

Paper is very important when doing platinum printing. The paper must be free of impurities and with a surface that is compatible with your intentions. Ideally you want 100 percent rag with no brighteners or buffering with a PH level between 5.5 and 7.5. Also the paper must be sturdy due to the long rinsing time. Handmade paper can often fall apart during the wet stages. Also it is better to rip the paper rather than cut with a metal knife because shavings can get into your paper and effect your print. It is better to trim the paper after the process is complete.