This set contains the 3 Joop Stoop Gutenberg black inks in tubes of 60ml.
Carbon black is the standard black.
Jet black is a blue black
Volcano black is warm.
Those inks are conceived according to a formula that allows printmakers to wipe off non-heated plates.
Composition and light fastness:
Carbon black PBk7 / PB61 - 8/8
Jet black PBk7 / PB61 / PV15:4 / PV23 / PB 15:3 - 8/8
Vulcano black PBk7 / PB61 / PR2 - 8/8