I have found that cutting the print slightly in a Ferricyanide bleach helps to clean up the whites and make the print sing when toneing RC MGIV in selenium, to promote colour change with this paper have found it nessesary to heat selenium on warming tray to about 30 oC when it produces the clasic eggplant colour. Word of warning hot selenium STINKS GOOD VENTILATION ESSENTIAL. I use Fotospeed toner mixed 1:20.