Hemogoblin vs Summoning Sickness

How close are they?

ΔE 7.4, close: similar, with a visible difference side by side. Summoning Sickness is more saturated, warmer than Hemogoblin.

Can I use Summoning Sickness instead of Hemogoblin?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Summoning Sickness is more saturated, warmer than Hemogoblin.

Can I use Hemogoblin instead of Summoning Sickness?

The same difference applies the other way round: Hemogoblin is 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.