I have used (and loved) KPT over the years, and was temporarily devastated at its demise. However, Kodak, in its infinite Yellow wisdom gives the following two formulae for those of us who still long for brown, archival and sodium sulfite vapors:
Kodak gives to working solution combinations. No.1 gives redder tones
than No.2
Formula No.1
Kodak Rapid Selenium Toner 17.0 ml
Kodak Brown Toner 75.0 ml
Kodalk (Sodium metaborate) 30.0 grams
Water to make 1.0 liter
This is a working solution.
Formula No.2
Kodak Rapid Selenium Toner 2.0 ml
Kodak Brown Toner 100.0 ml
Kodalk 8.0 grams
Water to make 1.0 liter
This is a working solution.
Formula No.2 tends to reduce the print a little so prints should be given a
little more exposure than normally.
The second toner has about half the capacity of the first.
Obviously all sorts of variations can be made.