Hi, I have started on the road with POP printing and I made my forst print a couple of days ago. the only problem is that I am lacking any dark shadows. I have exposed the POP so that the highlights when fully developed are not even white any more so I have technically overexposed but the shadows stay a dark brown, where they are black on a regular silver print. I expose, the rinse in water for 15 mins, then dunk in a fresh bath of sodium thiosulphate for 15mins, then another fresh bath of sodium thiosulphate for another 15mins. Then I wash in water for an hour. After that I then tone with a 1:75 or so dilution of MACO selenium toner for about 7 or 8 minutes. Then I take it out and wash for another hour. Then I leave it to dry. I think I did all the processing right. Is selenium just not a good idea for toning POP?