Stormvermin Fur vs Eidolon Grey

How close are they?

ΔE 9.5, close: similar, with a visible difference side by side. Eidolon Grey is more muted, cooler than Stormvermin Fur.

Can I use Eidolon Grey instead of Stormvermin Fur?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Eidolon Grey is more muted, cooler than Stormvermin Fur.

Can I use Stormvermin Fur instead of Eidolon Grey?

The same difference applies the other way round: Stormvermin Fur 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.