I find the results with selenium toner vary enormously depending on paper, developer and toner dilution. I find a stronger toner (1:5 or more) gives warmer browns than 1:9 which gives a 'plummy' tone to the shadows. I generally develop Multigrade WArmtone FB in either ID78 ( a home brew similar to the old Agfa Neutol WA) or Bromophen diluted 1:4 then tone in selenium (Fotospeed) 1:9. I usually only tone until the slight greenish tint has disappeared which takes about 5 minutes at 24 degC but occasionally I tone for a bit longer. See my pic at:
http://www.film-and-darkroom-user.or...pictureid=5195