Digital BW, The Print

Greetings,  I've been fooling around with trying to get a somewhat 
close match to a cold toned (selenium) print.  My method so far has 
been to work in duotone or tritone from RGB and then back to RGB 
because I'm printing with colour ink.   My ink is Lysonic archival 
and the paper I'm using is arches cold press 140lb. natural white. 
Just wondering if anyone else has any suggestions on getting a cold 
toned print with colour ink.
thanks
Larry