I printed out some Ziatype tests on Arches Pt and found out that black looks as darkly gray even at a over exposition
Arches was pre-treatmented in slightly acidic (oxalic) water
I tried to print on both parties of paper
I tried to develop in tap, citric and oxalic water

I already printed much kallitypes and always received the rich and saturated "brown-black" blacks

council is very necessary