Ive developed black specs on my platinum/palladium prints. I've filtered my palladium, ferric oxalate, and potassium oxalate through Whatman filter paper and I'm still getting them. The only thing that is different than before getting them was I opened a new pack of platinotype paper. I've closely looked at the paper and I can't see any type of blemishes that would cause a problem. It looks exactly as the last pack of paper looked, by eye. Does anyone have any idea what may be causing this?