Does anyone have any insight into the cause and prevention of these spots or stains that appear on the back of salt prints that I have been printing?
The only appear about half-way through the final wash – never during the initial clearing, washing, toning and fix stages. I clear in a 3% solution of kosher salt with 1% citric acid for 5b minutes followed by a 15 minute rinse in running water, platinum toning followed by a 6 minute wash in running water, 2 minute fix in 10% sodium thiosulfate, 5 minute rinse in running water, and a final wash of 40 minutes. They appear pronounced on the backside of the paper as shown and occasionally appear very faint on the image side. Paper is Bergger Cot 320.