Hej Oskar & välkommen!
To try to clarify matters:
what effects are you after?
Could it be old time’s duplex print?
Or monochrome? Or do you strive
for the difference between certain
photo papers (like Agfa Brovira); where
some papers produced warm brown
tones (instead of black), and others
gave a cold black?
By the way — while speaking about old photo papers:
it is very easy to ape the effect of hard vs. soft paper
grades — just change the slope of a tone curve 
Have fun!
Claes in Lund, Sweden