I am having the problem of some of my prints having a much warmer base tone that others made during the same printing session. I do not have a print washer, so I manually wash all my prints together at the end of the session. This means that some of the prints have been soaking for as long as a few hours, while others go straight into the wash. I have most noticed this with Bergger VCCB, and Forte Poly warmtone, both warm tone papers. My first thought is that these papers have artificial whiteners, and that the prints that soak for the longest have more of these whiteners washed out, exposing the natural tone of the paper. However, I made just three prints the other day and I noticed a distinct difference in paper base tone, the whole session lasting maybe an hour. I have thought that the paper may not be entirely consistent, but more likely I'm doing something wrong. One last thought is that this could be caused by fogging of some sort. ??