i selected developer for the tonal scale, used a very weak selenium solution (1:20 or so) briefly adjust the tint of the final print, and then nelson gold toner (diluted 1:2, much weaker than recommended) for warmth. fortezo is very active and responds more quickly and intensely to toners than other papers i've used. dilute developers slow the reaction enough to make it controlable.
there's also a complex interaction between degree of development and final print color after toning. it took me five years to figure this out, but i think i have it pretty well dialed in now. i can share my notes if anyone's interested.
luckily the paper's back on the market so all this arcane knowledge isn't completely obsolete. yet.
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