Soulstone Blue vs Cygnar Blue Base

How close are they?

ΔE 10.4, fair: the same colour family, but not a straight swap. Cygnar Blue Base is a little darker, more saturated, warmer than Soulstone Blue. They are different kinds of paint: Citadel Soulstone Blue is a technical paint or medium and Formula P3 Cygnar Blue Base 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 Cygnar Blue Base instead of Soulstone Blue?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Cygnar Blue Base is a little darker, more saturated, warmer than Soulstone Blue. They are different kinds of paint.

Can I use Soulstone Blue instead of Cygnar Blue Base?

The same difference applies the other way round: Soulstone Blue is a little lighter, more muted, cooler.

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.