I have some very slight fogging apparent on my PtPd prints. That is, some tone remains after clearing in the print border, even when the sensitizer is covered with Rubylith film during exposure.
It’s not the neg curve. The problem was first evident in the margins of my print, and so I assumed that the neg border was not dense enough. (ie a curve problem). I ruled this out by testing a print covered partly with Rubylith, which should prevent UV light transmission. The problem still persists.
It’s not the darkroom. I have carried out exhaustive tests to see if there is a stray UV source in the darkroom. There is not.
The problem is more apparent when the paper is wet. I am using Legion Revere. After the paper has dried down, the problem ALMOST disappears (but not quite).
Could it be that the sensitizer itself is fogged slightly? It is stored in a brown bottle in the darkroom, with the lid on whenever the darkroom door is opened. It does not receive UV light in the darkroom, but perhaps it could have happened before I received it.
Any other thoughts?