Nuln Oil is a Shade Paint from the Citadel Colour Line by Games Workshop with the item number 24-14.
Citadel Shade Paint: How They'll Really Look On Miniatures
Citadel Shade: Nuln Oil (18ml) [24-14] - Everything Airbrush
Shade Nuln Oil 18ml
Citadel Shades – HobbyBastion
Citadel Colour Shade Paints - Games Workshops - Full Range
Citadel Paint, Shade: Nuln Oil : Toys & Games
Prided myself in never spilling it, welp, I join y'all nuln oil spillers : r/Warhammer
Citadel Colour Shade Paint Set (9 Paints) - Rekreation Games
Citadel Shade: Nuln Oil 18ml
CITADEL COLOUR: SHADE PAINT SET