Grim Black vs Olive Ink

How close are they?

ΔE 10.2, fair: the same colour family, but not a straight swap. Olive Ink is a little darker, more saturated than Grim Black. They are different kinds of paint: Army Painter Grim Black is a one-coat contrast-style paint and Nocturna Models Olive Ink is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.

Can I use Olive Ink instead of Grim Black?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Olive Ink is a little darker, more saturated than Grim Black. They are different kinds of paint.

Can I use Grim Black instead of Olive Ink?

The same difference applies the other way round: Grim Black is a little lighter, more muted.

ΔE is the colour difference between our two swatch estimates: under about 6 is close, over about 15 is loose. Real paints also differ in finish, coverage and how they thin, so test before you commit.