I only recently started experimenting with toning my prints but ran into a problem today. I was split toning some MCC and MGIV FB using KRST and Berg's Rapid Sepia RC toner. The problem I had was with the sepia. The white borders of the prints were stained with the sepia tone and wouldn't stay white. I don't think poor washing was to blame since I used HCA and the prints were washed for about an hour after fixing. Besides, I had no staining problems with the KRST, only the sepia. I know that Berg claims their "RC" toner can be used with fiber based paper but is this one of the side effects? Does anyone know what the culprit might be?