Stormhost Silver vs Dead Star

How close are they?

ΔE 9.8, close: similar, with a visible difference side by side. Dead Star is a little lighter than Stormhost Silver.

Can I use Dead Star instead of Stormhost Silver?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Dead Star is a little lighter than Stormhost Silver.

Can I use Stormhost Silver instead of Dead Star?

The same difference applies the other way round: Stormhost Silver is a little darker.

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.