Turquoise vs Nighthaunt Gloom

How close are they?

ΔE 12.0, fair: the same colour family, but not a straight swap. Nighthaunt Gloom is more muted, cooler than Turquoise. They are different kinds of paint: AMMO by Mig Turquoise is an opaque base/layer paint and Citadel Nighthaunt Gloom is a one-coat contrast-style paint, so they won’t behave the same on the model even where the colour is close.

Can I use Nighthaunt Gloom instead of Turquoise?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Nighthaunt Gloom is more muted, cooler than Turquoise. They are different kinds of paint.

Can I use Turquoise instead of Nighthaunt Gloom?

The same difference applies the other way round: Turquoise is more saturated, warmer.

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.