Spiritstone Red vs Ruby Red

How close are they?

ΔE 20.5, loose: different enough that you should pick on purpose. Ruby Red is much more muted than Spiritstone Red. They are different kinds of paint: Citadel Spiritstone Red is a technical paint or medium and Nocturna Models Ruby Red is an opaque base/layer paint, so they won’t behave the same on the model even where the colour is close.

Can I use Ruby Red instead of Spiritstone Red?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Ruby Red is much more muted than Spiritstone Red. They are different kinds of paint.

Can I use Spiritstone Red instead of Ruby Red?

The same difference applies the other way round: Spiritstone Red is much more saturated.

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.