Wow Mike - great work on the pdf there - it is a keeper
I am really a fan of selenium toning. I like to pull them just as the color changes - on Forte FB mostly. This gives a nice 2 tone effect -subtle and slightly understated. - If I really want brown, I selenuim tone (all 1:9) as described and then use pot feri to bleach it back. That gives me a brown brown look and really makes the highlights sparkle. It is good for prints that need a boost and if the highlights will permit it.